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(Sep  3 10:04 2008  README  Page 1) 144.161 Tj
0 -28.4801 Td
(xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson\
's Unix) 305.796 Tj
0 -37.9735 Td
(Version 6 \(v6\).  xv6 loosely follows the structure and style \
of v6,) 292.6905 Tj
0 -47.4668 Td
(but is implemented for a modern x86-based multiprocessor using \
ANSI C.) 305.796 Tj
0 -66.4535 Td
(ACKNOWLEDGMENTS) 65.5277 Tj
0 -85.4402 Td
(xv6 is inspired by John Lions's Commentary on UNIX 6th Edition \
\(Peer) 297.059 Tj
0 -94.9336 Td
(to Peer Communications; ISBN: 1-57398-013-7; 1st edition \(June\
 14,) 288.322 Tj
0 -104.4269 Td
(2000\)\). See also http://pdos.csail.mit.edu/6.828/2007/v6.html\
, which) 297.059 Tj
0 -113.9203 Td
(provides pointers to on-line resources for v6.) 200.9517 Tj
0 -132.907 Td
(xv6 borrows code from the following sources:) 192.2146 Tj
17.4613 -142.4004 Td
(JOS \(asm.h, elf.h, mmu.h, bootasm.S, ide.c, console.c, and oth\
ers\)) 288.322 Tj
17.4613 -151.8937 Td
(Plan 9 \(bootother.S, mp.h, mp.c, lapic.c\)) 179.1091 Tj
17.4613 -161.3871 Td
(FreeBSD \(ioapic.c\)) 78.6333 Tj
17.4613 -170.8804 Td
(NetBSD \(console.c\)) 78.6333 Tj
0 -189.8667 Td
(The following people made contributions:) 174.7406 Tj
17.4613 -199.3601 Td
(Russ Cox \(context switching, locking\)) 161.635 Tj
17.4613 -208.8535 Td
(Cliff Frey \(MP\)) 65.5277 Tj
17.4613 -218.3468 Td
(Xiao Yu \(MP\)) 52.4222 Tj
0 -237.3335 Td
(The code in the files that constitute xv6 is) 192.2146 Tj
0 -246.8269 Td
(Copyright 2006-2007 Frans Kaashoek, Robert Morris, and Russ Cox\
.) 279.5849 Tj
0 -265.8136 Td
(ERROR REPORTS) 56.7907 Tj
0 -284.8003 Td
(If you spot errors or have suggestions for improvement, please \
send) 292.6905 Tj
0 -294.2936 Td
(email to Frans Kaashoek and Robert Morris \(kaashoek,rtm@csail.\
mit.edu\). ) 314.533 Tj
0 -313.2803 Td
(BUILDING AND RUNNING XV6) 104.8443 Tj
0 -332.267 Td
(To build xv6 on an x86 ELF machine \(like Linux or FreeBSD\), r\
un "make".) 310.1645 Tj
0 -341.7604 Td
(On non-x86 or non-ELF machines \(like OS X, even on x86\), you \
will) 283.9534 Tj
0 -351.2538 Td
(need to install a cross-compiler gcc suite capable of producing\
 x86 ELF) 310.1645 Tj
0 -360.7471 Td
(binaries.  See http://pdos.csail.mit.edu/6.828/2007/tools.html.) 275.2164 Tj
0 -370.2405 Td
(Then run "make TOOLPREFIX=i386-jos-elf-".) 179.1091 Tj
0 -389.2272 Td
(To run xv6, you can use Bochs or QEMU, both PC simulators.) 253.3738 Tj
0 -398.7205 Td
(Bochs makes debugging easier, but QEMU is much faster. ) 240.2683 Tj
0 -408.2139 Td
(To run in Bochs, run "make bochs" and then type "c" at the boch\
s prompt.) 314.533 Tj
0 -417.7073 Td
(To run in QEMU, run "make qemu".  Both log the xv6 screen outpu\
t to ) 297.059 Tj
0 -427.2006 Td
(standard output.) 69.8962 Tj
0 -446.1873 Td
(To create a typeset version of the code, run "make xv6.pdf".) 262.1109 Tj
0 -455.6807 Td
(This requires the "mpage" text formatting utility.) 218.4257 Tj
0 -465.174 Td
(See http://www.mesa.nl/pub/mpage/.) 148.5295 Tj
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(Sep  3 10:04 2008  table of contents  Page 1) 192.2146 Tj
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(The numbers to the left of the file names in the table are shee\
t numbers.) 318.9016 Tj
0 -37.9735 Td
(The source code has been printed in a double column format with\
 fifty) 301.4275 Tj
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(lines per column, giving one hundred lines per sheet \(or page\)\
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(23 traps.h) 43.6851 Tj
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(51 pipe.c) 39.3166 Tj
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(01 param.h) 43.6851 Tj
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(24 vectors.pl) 56.7907 Tj
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(02 defs.h) 39.3166 Tj
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(24 trapasm.S) 52.4222 Tj
-6019.2 TJm
(# string operations) 83.0018 Tj
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(03 x86.h) 34.9481 Tj
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(25 trap.c) 39.3166 Tj
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(53 string.c) 48.0537 Tj
0 -132.9071 Td
(05 asm.h) 34.9481 Tj
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(26 syscall.h) 52.4222 Tj
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(06 mmu.h) 34.9481 Tj
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(26 syscall.c) 52.4222 Tj
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(# low-level hardware) 87.3703 Tj
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(08 elf.h) 34.9481 Tj
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(28 sysproc.c) 52.4222 Tj
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(55 mp.c) 30.5796 Tj
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(30 stat.h) 39.3166 Tj
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104.768 -218.3473 Td
(31 file.h) 39.3166 Tj
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(62 console.c) 52.4222 Tj
0 -227.8407 Td
(# locks) 30.5796 Tj
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(31 fs.h) 30.5796 Tj
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(66 timer.c) 43.6851 Tj
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(13 spinlock.h) 56.7907 Tj
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(32 fsvar.h) 43.6851 Tj
0 -246.8274 Td
(13 spinlock.c) 56.7907 Tj
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(33 ide.c) 34.9481 Tj
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(# user-level) 52.4222 Tj
104.768 -256.3208 Td
(35 bio.c) 34.9481 Tj
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(67 initcode.S) 56.7907 Tj
0 -265.8141 Td
(# processes) 48.0537 Tj
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(36 fs.c) 30.5796 Tj
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(67 init.c) 39.3166 Tj
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(15 proc.h) 39.3166 Tj
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(44 file.c) 39.3166 Tj
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(68 usys.S) 39.3166 Tj
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(16 proc.c) 39.3166 Tj
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(45 sysfile.c) 52.4222 Tj
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(68 sh.c) 30.5796 Tj
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(21 swtch.S) 43.6851 Tj
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(50 exec.c) 39.3166 Tj
0 -303.7876 Td
(22 kalloc.c) 48.0537 Tj
0 -341.7606 Td
(The source listing is preceded by a cross-reference that lists \
every defined ) 336.3756 Tj
0 -351.2539 Td
(constant, struct, global variable, and function in xv6.  Each e\
ntry gives,) 323.2701 Tj
0 -360.7473 Td
(on the same line as the name, the line number \(or, in a few ca\
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0 -370.2406 Td
(where the name is defined.  Successive lines in an entry list t\
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0 -379.734 Td
(numbers where the name is used.  For example, this entry:) 249.0053 Tj
17.4613 -398.7207 Td
(swtch 2256) 43.6851 Tj
34.9226 -408.2141 Td
(0311 1928 1962 2255) 83.0018 Tj
34.9226 -417.7074 Td
(2256) 17.4741 Tj
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(indicates that swtch is defined on line 2256 and is mentioned o\
n five lines) 327.6386 Tj
-0 -446.1875 Td
(on sheets 03, 19, and 22.) 109.2129 Tj
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(Sep  3 10:04 2008  cross-references  Page 1) 187.8461 Tj
0 -28.4801 Td
(acquire 1375) 52.4222 Tj
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(BPB 3193) 34.9481 Tj
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17.4613 -94.9332 Td
(4991 5205 5209) 61.1592 Tj
-11035.5 TJm
(5824 5834) 39.3166 Tj
0 -104.4266 Td
(filedup 4438) 52.4222 Tj
-12038.8 TJm
(ID 5660) 30.5796 Tj
17.4613 -113.9199 Td
(0227 1741 4438 4442) 83.0018 Tj
-8527.14 TJm
(5660 5693 5766) 61.1592 Tj
17.4613 -123.4133 Td
(4634) 17.4741 Tj
-14045.6 TJm
(IDE_BSY 3312) 52.4222 Tj
0 -132.9067 Td
(fileinit 4412) 56.7907 Tj
-13543.7 TJm
(3312 3336) 39.3166 Tj
17.4613 -142.4 Td
(0228 1229 4412) 61.1592 Tj
-9028.94 TJm
(IDE_CMD_READ 3317) 74.2647 Tj
0 -151.8934 Td
(fileread 4502) 56.7907 Tj
-13543.7 TJm
(3317 3391) 39.3166 Tj
17.4613 -161.3867 Td
(0229 4502 4517 4609) 83.0018 Tj
-6520.6 TJm
(IDE_CMD_WRITE 3318) 78.6333 Tj
0 -170.8801 Td
(filestat 4478) 56.7907 Tj
-13543.7 TJm
(3318 3388) 39.3166 Tj
17.4613 -180.3735 Td
(0230 4478 4658) 61.1592 Tj
-9028.94 TJm
(IDE_DF 3314) 48.0537 Tj
0 -189.8664 Td
(filewrite 4522) 61.1592 Tj
-13042 TJm
(3314 3338) 39.3166 Tj
17.4613 -199.3598 Td
(0231 4522 4537 4621) 83.0018 Tj
-6520.6 TJm
(IDE_DRDY 3313) 56.7907 Tj
0 -208.8532 Td
(file_table_lock 4408) 87.3703 Tj
-10032 TJm
(3313 3336) 39.3166 Tj
17.4613 -218.3465 Td
(4408 4414 4423 4428) 83.0018 Tj
-6520.6 TJm
(IDE_ERR 3315) 52.4222 Tj
17.4613 -227.8399 Td
(4432 4440 4444 4456) 83.0018 Tj
-8527.14 TJm
(3315 3338) 39.3166 Tj
17.4613 -237.3332 Td
(4460 4466) 39.3166 Tj
-11537.3 TJm
(ide_init 3351) 56.7907 Tj
0 -246.8266 Td
(FL_IF 0610) 43.6851 Tj
-15048.7 TJm
(0251 1232 3351) 61.1592 Tj
17.4613 -256.32 Td
(0610 1462 1468 1771) 83.0018 Tj
-6520.6 TJm
(ide_intr 3402) 56.7907 Tj
17.4613 -265.8133 Td
(1855 5758) 39.3166 Tj
-13543.8 TJm
(0252 2557 3402) 61.1592 Tj
0 -275.3067 Td
(fork1 7039) 43.6851 Tj
-13042.1 TJm
(ide_lock 3324) 56.7907 Tj
17.4613 -284.8 Td
(6900 6942 6954 6961) 83.0018 Tj
-8527.14 TJm
(3324 3355 3406 3408) 83.0018 Tj
17.4613 -294.2934 Td
(6976 7024 7039) 61.1592 Tj
-11035.5 TJm
(3425 3465 3480 3482) 83.0018 Tj
0 -303.7868 Td
(forkret 1880) 52.4222 Tj
-12038.8 TJm
(ide_rw 3454) 48.0537 Tj
17.4613 -313.2801 Td
(1614 1747 1880) 61.1592 Tj
-11035.5 TJm
(0253 3454 3459 3461) 83.0018 Tj
0 -322.7735 Td
(forkret1 2484) 56.7907 Tj
-13543.7 TJm
(3608 3619) 39.3166 Tj
17.4613 -332.2664 Td
(1615 1886 2483 2484) 83.0018 Tj
-6520.6 TJm
(ide_start_request 3375) 96.1073 Tj
0 -341.7598 Td
(gatedesc 0751) 56.7907 Tj
-13543.7 TJm
(3328 3375 3378 3423) 83.0018 Tj
17.4613 -351.2532 Td
(0414 0417 0751 2510) 83.0018 Tj
-8527.14 TJm
(3475) 17.4741 Tj
0 -360.7465 Td
(getcallerpcs 1422) 74.2647 Tj
-9530.47 TJm
(ide_wait_ready 3332) 83.0018 Tj
17.4613 -370.2399 Td
(0312 1392 1422 2129) 83.0018 Tj
-8527.14 TJm
(3332 3358 3380 3413) 83.0018 Tj
17.4613 -379.7332 Td
(6575) 17.4741 Tj
-14045.6 TJm
(idtinit 2528) 52.4222 Tj
0 -389.2266 Td
(getcmd 6984) 48.0537 Tj
-14547 TJm
(0340 1256 2528) 61.1592 Tj
17.4613 -398.72 Td
(6984 7015) 39.3166 Tj
-11537.3 TJm
(idup 3838) 39.3166 Tj
0 -408.2133 Td
(gettoken 7156) 56.7907 Tj
-13543.7 TJm
(0237 1742 3838 4361) 83.0018 Tj
17.4613 -417.7067 Td
(7156 7241 7245 7257) 83.0018 Tj
-6520.6 TJm
(iget 3803) 39.3166 Tj
17.4613 -427.2 Td
(7270 7271 7307 7311) 83.0018 Tj
-8527.14 TJm
(3803 3823 3968 4234) 83.0018 Tj
17.4613 -436.6934 Td
(7333) 17.4741 Tj
-16052.1 TJm
(4359) 17.4741 Tj
0 -446.1868 Td
(growproc 1653) 56.7907 Tj
-11537.1 TJm
(iinit 3789) 43.6851 Tj
17.4613 -455.6801 Td
(0295 1653 2858) 61.1592 Tj
-11035.5 TJm
(0238 1230 3789) 61.1592 Tj
0 -465.1735 Td
(holding 1440) 52.4222 Tj
-12038.8 TJm
(ilock 3852) 43.6851 Tj
17.4613 -474.6665 Td
(0313 1378 1404 1440) 83.0018 Tj
-8527.14 TJm
(0239 3852 3858 3878) 83.0018 Tj
17.4613 -484.1598 Td
(1859) 17.4741 Tj
-16052.1 TJm
(4364 4481 4511 4531) 83.0018 Tj
0 -493.6532 Td
(ialloc 3952) 48.0537 Tj
-14547 TJm
(4672 4683 4693 4762) 83.0018 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
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pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
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/F8_0 8.7022 Tf
(Sep  3 10:04 2008  cross-references  Page 5) 187.8461 Tj
17.4613 -28.4801 Td
(4774 4809 4813 4825) 83.0018 Tj
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(5932) 17.4741 Tj
17.4613 -37.9735 Td
(4867 4937 5020 6444) 83.0018 Tj
-6520.6 TJm
(IO_PIC1 5957) 52.4222 Tj
17.4613 -47.4668 Td
(6513 6533) 39.3166 Tj
-13543.8 TJm
(5957 5970 5985 5994) 83.0018 Tj
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(inb 0353) 34.9481 Tj
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(5997 6002 6012 6026) 83.0018 Tj
17.4613 -66.4535 Td
(0353 0928 0936 1154) 83.0018 Tj
-8527.14 TJm
(6027) 17.4741 Tj
17.4613 -75.9469 Td
(3336 3363 5646 6214) 83.0018 Tj
-6520.6 TJm
(IO_PIC2 5958) 52.4222 Tj
17.4613 -85.4403 Td
(6217 6282 6307 6309) 83.0018 Tj
-8527.14 TJm
(5958 5971 5986 6015) 83.0018 Tj
0 -94.9336 Td
(INDIRECT 3168) 56.7907 Tj
-13543.7 TJm
(6016 6017 6020 6029) 83.0018 Tj
17.4613 -104.427 Td
(3168 4027 4030 4065) 83.0018 Tj
-8527.14 TJm
(6030) 17.4741 Tj
17.4613 -113.9203 Td
(4066 4073) 39.3166 Tj
-11537.3 TJm
(IO_RTC 5800) 48.0537 Tj
0 -123.4137 Td
(initlock 1363) 56.7907 Tj
-13543.7 TJm
(5800 5813 5814) 61.1592 Tj
17.4613 -132.9071 Td
(0314 1363 1620 2231) 83.0018 Tj
-6520.6 TJm
(IO_TIMER1 6609) 61.1592 Tj
17.4613 -142.4004 Td
(2524 3355 3542 3791) 83.0018 Tj
-8527.14 TJm
(6609 6618 6628 6629) 83.0018 Tj
17.4613 -151.8938 Td
(4414 5184 6553 6554) 83.0018 Tj
-6520.6 TJm
(IPB 3187) 34.9481 Tj
0 -161.3871 Td
(inode 3252) 43.6851 Tj
-15048.7 TJm
(3187 3190 3196 3868) 83.0018 Tj
17.4613 -170.8805 Td
(0203 0234 0235 0236) 83.0018 Tj
-8527.14 TJm
(3962 3983) 39.3166 Tj
17.4613 -180.3739 Td
(0237 0239 0240 0241) 83.0018 Tj
-6520.6 TJm
(iput 3902) 39.3166 Tj
17.4613 -189.8672 Td
(0242 0243 0245 0246) 83.0018 Tj
-8527.14 TJm
(0240 2020 3902 3908) 83.0018 Tj
17.4613 -199.3606 Td
(0247 0248 0249 1539) 83.0018 Tj
-8527.14 TJm
(3927 4260 4382 4471) 83.0018 Tj
17.4613 -208.8539 Td
(2951 2952 3106 3252) 83.0018 Tj
-8527.14 TJm
(4687 4943) 39.3166 Tj
17.4613 -218.3473 Td
(3675 3785 3802 3805) 83.0018 Tj
-6520.6 TJm
(IRQ_ERROR 2384) 61.1592 Tj
17.4613 -227.8407 Td
(3811 3837 3838 3852) 83.0018 Tj
-8527.14 TJm
(2384 5727) 39.3166 Tj
17.4613 -237.334 Td
(3884 3902 3924 3951) 83.0018 Tj
-6520.6 TJm
(IRQ_IDE 2383) 52.4222 Tj
17.4613 -246.8274 Td
(3977 4010 4052 4082) 83.0018 Tj
-8527.14 TJm
(2383 2556 3356 3357) 83.0018 Tj
17.4613 -256.3207 Td
(4102 4152 4211 4212) 83.0018 Tj
-6520.6 TJm
(IRQ_KBD 2382) 52.4222 Tj
17.4613 -265.8141 Td
(4252 4256 4353 4356) 83.0018 Tj
-8527.14 TJm
(2382 2560 6560 6561) 83.0018 Tj
17.4613 -275.3075 Td
(4388 4395 4666 4702) 83.0018 Tj
-6520.6 TJm
(IRQ_OFFSET 2379) 65.5277 Tj
17.4613 -284.8008 Td
(4753 4800 4804 4856) 83.0018 Tj
-8527.14 TJm
(2379 2547 2556 2560) 83.0018 Tj
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(4903 4921 4933 5015) 83.0018 Tj
-8527.14 TJm
(2564 2591 5707 5714) 83.0018 Tj
17.4613 -303.7875 Td
(6435 6501) 39.3166 Tj
-13543.8 TJm
(5727 5917 5931 5997) 83.0018 Tj
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(INPUT_BUF 6450) 61.1592 Tj
-13042 TJm
(6016) 17.4741 Tj
17.4613 -322.7743 Td
(6450 6453 6474 6486) 83.0018 Tj
-6520.6 TJm
(IRQ_SLAVE 5960) 61.1592 Tj
17.4613 -332.2676 Td
(6487 6489 6518) 61.1592 Tj
-11035.5 TJm
(5960 5964 6002 6017) 83.0018 Tj
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(insl 0362) 39.3166 Tj
-13543.8 TJm
(IRQ_SPURIOUS 2385) 74.2647 Tj
17.4613 -351.2543 Td
(0362 1173 3414) 61.1592 Tj
-11035.5 TJm
(2385 2564 5707) 61.1592 Tj
0 -360.7477 Td
(INT_DISABLED 5869) 74.2647 Tj
-9530.47 TJm
(IRQ_TIMER 2381) 61.1592 Tj
17.4613 -370.2411 Td
(5869 5917) 39.3166 Tj
-13543.8 TJm
(2381 2547 2591 5714) 83.0018 Tj
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(IOAPIC 5858) 48.0537 Tj
-14547 TJm
(6630) 17.4741 Tj
17.4613 -389.2278 Td
(5858 5908) 39.3166 Tj
-11537.3 TJm
(isdirempty 4702) 65.5277 Tj
0 -398.7211 Td
(ioapic_enable 5923) 78.6333 Tj
-11035.3 TJm
(4702 4709 4778) 61.1592 Tj
17.4613 -408.2145 Td
(0256 3357 5923 6561) 83.0018 Tj
-6520.6 TJm
(ismp 5514) 39.3166 Tj
0 -417.7079 Td
(ioapic_id 5516) 61.1592 Tj
-13042 TJm
(0276 1233 5514 5613) 83.0018 Tj
17.4613 -427.2012 Td
(0257 5516 5628 5911) 83.0018 Tj
-8527.14 TJm
(5905 5925) 39.3166 Tj
17.4613 -436.6946 Td
(5912) 17.4741 Tj
-14045.6 TJm
(itrunc 4052) 48.0537 Tj
0 -446.1879 Td
(ioapic_init 5901) 69.8962 Tj
-12038.7 TJm
(3675 3911 4052) 61.1592 Tj
17.4613 -455.6813 Td
(0258 1226 5901 5912) 83.0018 Tj
-6520.6 TJm
(iunlock 3884) 52.4222 Tj
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(ioapic_read 5884) 69.8962 Tj
-12038.7 TJm
(0241 3884 3887 3926) 83.0018 Tj
17.4613 -474.6676 Td
(5884 5909 5910) 61.1592 Tj
-11035.5 TJm
(4371 4483 4514 4534) 83.0018 Tj
0 -484.161 Td
(ioapic_write 5891) 74.2647 Tj
-11537 TJm
(4679 4880 4942 6439) 83.0018 Tj
17.4613 -493.6543 Td
(5891 5917 5918 5931) 83.0018 Tj
-8527.14 TJm
(6506) 17.4741 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  cross-references  Page 6) 187.8461 Tj
0 -28.4801 Td
(iunlockput 3924) 65.5277 Tj
-10533.8 TJm
(KEY_RT 6074) 48.0537 Tj
17.4613 -37.9735 Td
(0242 3924 4366 4375) 83.0018 Tj
-8527.14 TJm
(6074 6117 6139 6163) 83.0018 Tj
17.4613 -47.4664 Td
(4378 4674 4686 4692) 83.0018 Tj
-6520.6 TJm
(KEY_UP 6071) 48.0537 Tj
17.4613 -56.9594 Td
(4696 4766 4771 4779) 83.0018 Tj
-8527.14 TJm
(6071 6115 6137 6161) 83.0018 Tj
17.4613 -66.4524 Td
(4780 4787 4791 4812) 83.0018 Tj
-6520.6 TJm
(kfree 2255) 43.6851 Tj
17.4613 -75.9453 Td
(4815 4822 4833 4834) 83.0018 Tj
-8527.14 TJm
(0262 1662 1731 2069) 83.0018 Tj
17.4613 -85.4383 Td
(4845 4869 4877 4913) 83.0018 Tj
-8527.14 TJm
(2070 2236 2255 2260) 83.0018 Tj
17.4613 -94.9313 Td
(4925 4939 5069 5112) 83.0018 Tj
-8527.14 TJm
(5101 5111 5202 5228) 83.0018 Tj
0 -104.4246 Td
(iupdate 3977) 52.4222 Tj
-12038.8 TJm
(kill 1976) 39.3166 Tj
17.4613 -113.918 Td
(0243 3913 3977 4077) 83.0018 Tj
-8527.14 TJm
(0296 1976 2578 2839) 83.0018 Tj
17.4613 -123.411 Td
(4178 4678 4695 4790) 83.0018 Tj
-8527.14 TJm
(6817) 17.4741 Tj
17.4613 -132.9039 Td
(4829 4840) 39.3166 Tj
-11537.3 TJm
(kinit 2225) 43.6851 Tj
0 -142.3973 Td
(I_BUSY 3266) 48.0537 Tj
-14547 TJm
(0263 1227 2225) 61.1592 Tj
17.4613 -151.8907 Td
(3266 3861 3863 3886) 83.0018 Tj
-6520.6 TJm
(KSTACKSIZE 0152) 65.5277 Tj
17.4613 -161.3836 Td
(3890 3907 3909 3915) 83.0018 Tj
-8527.14 TJm
(0152 1283 1284 1680) 83.0018 Tj
0 -170.877 Td
(I_VALID 3267) 52.4222 Tj
-14045.3 TJm
(1719 1723 1731 2070) 83.0018 Tj
17.4613 -180.3703 Td
(3267 3866 3876 3905) 83.0018 Tj
-6520.6 TJm
(lapicw 5690) 48.0537 Tj
0 -189.8633 Td
(kalloc 2304) 48.0537 Tj
-14547 TJm
(5690 5707 5713 5714) 83.0018 Tj
17.4613 -199.3567 Td
(0261 1283 1657 1719) 83.0018 Tj
-8527.14 TJm
(5715 5718 5719 5724) 83.0018 Tj
17.4613 -208.8497 Td
(1730 1764 2231 2304) 83.0018 Tj
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(5727 5730 5731 5734) 83.0018 Tj
17.4613 -218.3426 Td
(2310 2328 5052 5178) 83.0018 Tj
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(5737 5738 5743 5775) 83.0018 Tj
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(kalloc_lock 2212) 69.8962 Tj
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17.4613 -237.3293 Td
(2212 2231 2265 2293) 83.0018 Tj
-8527.14 TJm
(5834) 17.4741 Tj
17.4613 -246.8223 Td
(2312 2316 2322 2326) 83.0018 Tj
-6520.6 TJm
(lapic_eoi 5772) 61.1592 Tj
0 -256.3157 Td
(KBDATAP 6054) 52.4222 Tj
-14045.3 TJm
(0271 2554 2558 2562) 83.0018 Tj
17.4613 -265.809 Td
(6054 6217) 39.3166 Tj
-13543.8 TJm
(2567 5772) 39.3166 Tj
0 -275.3024 Td
(kbd_getc 6206) 56.7907 Tj
-11537.1 TJm
(lapic_init 5701) 65.5277 Tj
17.4613 -284.7958 Td
(6206 6248) 39.3166 Tj
-13543.8 TJm
(0272 1220 1258 5701) 83.0018 Tj
0 -294.2891 Td
(kbd_intr 6246) 56.7907 Tj
-11537.1 TJm
(lapic_startap 5805) 78.6333 Tj
17.4613 -303.7825 Td
(0266 2561 6246) 61.1592 Tj
-11035.5 TJm
(0273 1286 5805) 61.1592 Tj
0 -313.2758 Td
(KBSTATP 6052) 52.4222 Tj
-12038.8 TJm
(lgdt 0403) 39.3166 Tj
17.4613 -322.7692 Td
(6052 6214) 39.3166 Tj
-13543.8 TJm
(0403 0411 0954 1054) 83.0018 Tj
0 -332.2622 Td
(KBS_DIB 6053) 52.4222 Tj
-14045.3 TJm
(1700) 17.4741 Tj
17.4613 -341.7555 Td
(6053 6215) 39.3166 Tj
-11537.3 TJm
(lidt 0417) 39.3166 Tj
0 -351.2489 Td
(KEY_DEL 6078) 52.4222 Tj
-14045.3 TJm
(0417 0425 2530) 61.1592 Tj
17.4613 -360.7422 Td
(6078 6119 6141 6165) 83.0018 Tj
-6520.6 TJm
(LINT0 5679) 43.6851 Tj
0 -370.2356 Td
(KEY_DN 6072) 48.0537 Tj
-14547 TJm
(5679 5718) 39.3166 Tj
17.4613 -379.729 Td
(6072 6115 6137 6161) 83.0018 Tj
-6520.6 TJm
(LINT1 5680) 43.6851 Tj
0 -389.2223 Td
(KEY_END 6070) 52.4222 Tj
-14045.3 TJm
(5680 5719) 39.3166 Tj
17.4613 -398.7157 Td
(6070 6118 6140 6164) 83.0018 Tj
-6520.6 TJm
(LIST 6860) 39.3166 Tj
0 -408.209 Td
(KEY_HOME 6069) 56.7907 Tj
-13543.7 TJm
(6860 6940 7107 7383) 83.0018 Tj
17.4613 -417.7024 Td
(6069 6118 6140 6164) 83.0018 Tj
-6520.6 TJm
(listcmd 6890 7101) 74.2647 Tj
0 -427.1958 Td
(KEY_INS 6077) 52.4222 Tj
-14045.3 TJm
(6890 6911 6941 7101) 83.0018 Tj
17.4613 -436.6891 Td
(6077 6119 6141 6165) 83.0018 Tj
-8527.14 TJm
(7103 7246 7357 7384) 83.0018 Tj
0 -446.1825 Td
(KEY_LF 6073) 48.0537 Tj
-12540.5 TJm
(LPTPORT 6265) 52.4222 Tj
17.4613 -455.6758 Td
(6073 6117 6139 6163) 83.0018 Tj
-8527.14 TJm
(6265 6282 6286 6287) 83.0018 Tj
0 -465.1692 Td
(KEY_PGDN 6076) 56.7907 Tj
-13543.7 TJm
(6288) 17.4741 Tj
17.4613 -474.6622 Td
(6076 6116 6138 6162) 83.0018 Tj
-6520.6 TJm
(lpt_putc 6278) 56.7907 Tj
0 -484.1555 Td
(KEY_PGUP 6075) 56.7907 Tj
-13543.7 TJm
(6278 6341) 39.3166 Tj
17.4613 -493.6489 Td
(6075 6116 6138 6162) 83.0018 Tj
-6520.6 TJm
(ltr 0429) 34.9481 Tj
Q
Q
Q
Q
showpage
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-612 -792 translate
0 0 612 792 re W
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[] 0 d
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/DeviceGray {} cs
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/DeviceGray {} CS
[0] SC
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0 -427.2004 Td
(readsect 1160) 56.7907 Tj
-13543.7 TJm
(0323 1781 5097 5375) 83.0018 Tj
17.4613 -436.6938 Td
(1160 1195) 39.3166 Tj
-11537.3 TJm
(sched 1853) 43.6851 Tj
0 -446.1872 Td
(readseg 1179) 52.4222 Tj
-14045.3 TJm
(1853 1856 1858 1860) 83.0018 Tj
17.4613 -455.6805 Td
(1113 1125 1135 1179) 83.0018 Tj
-8527.14 TJm
(1862 1873 1925 2040) 83.0018 Tj
0 -465.1739 Td
(read_ebp 0392) 56.7907 Tj
-11537.1 TJm
(scheduler 1808) 61.1592 Tj
17.4613 -474.6668 Td
(0392 5762) 39.3166 Tj
-13543.8 TJm
(0299 1263 1808) 61.1592 Tj
0 -484.1602 Td
(read_eflags 0435) 69.8962 Tj
-10032.1 TJm
(SCROLLLOCK 6064) 65.5277 Tj
17.4613 -493.6536 Td
(0435 1459 1468 1855) 83.0018 Tj
-8527.14 TJm
(6064 6097) 39.3166 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  cross-references  Page 10) 192.2146 Tj
0 -28.4801 Td
(SECTSIZE 1111) 56.7907 Tj
-13543.7 TJm
(5156 5165 6258 6270) 83.0018 Tj
17.4613 -37.9735 Td
(1111 1125 1173 1186) 83.0018 Tj
-8527.14 TJm
(6452) 17.4741 Tj
17.4613 -47.4664 Td
(1189 1194) 39.3166 Tj
-11537.3 TJm
(start 0912 1026 6707) 87.3703 Tj
0 -56.9598 Td
(SEG 0654) 34.9481 Tj
-16052 TJm
(0911 0912 0974 1025) 83.0018 Tj
17.4613 -66.4531 Td
(0654 1685 1686 1690) 83.0018 Tj
-8527.14 TJm
(1026 1073 1074 2229) 83.0018 Tj
17.4613 -75.9461 Td
(1691) 17.4741 Tj
-16052.1 TJm
(2232 2233 2236 6706) 83.0018 Tj
0 -85.4395 Td
(SEG16 0659) 43.6851 Tj
-15048.7 TJm
(6707) 17.4741 Tj
17.4613 -94.9328 Td
(0659 1687) 39.3166 Tj
-11537.3 TJm
(stat 3050) 39.3166 Tj
0 -104.4262 Td
(segdesc 0627) 52.4222 Tj
-14045.3 TJm
(0207 0230 0248 3050) 83.0018 Tj
17.4613 -113.9196 Td
(0400 0403 0627 0651) 83.0018 Tj
-8527.14 TJm
(3665 4082 4478 4553) 83.0018 Tj
17.4613 -123.4125 Td
(0654 0659 1562) 61.1592 Tj
-11035.5 TJm
(4654 6753) 39.3166 Tj
0 -132.9059 Td
(SEG_ASM 0558) 52.4222 Tj
-12038.8 TJm
(stati 4082) 43.6851 Tj
17.4613 -142.3992 Td
(0558 0985 0986 1081) 83.0018 Tj
-8527.14 TJm
(0248 4082 4482) 61.1592 Tj
17.4613 -151.8922 Td
(1082) 17.4741 Tj
-14045.6 TJm
(STA_R 0567 0671) 65.5277 Tj
0 -161.3856 Td
(SEG_KCODE 1501) 61.1592 Tj
-13042 TJm
(0567 0671 0985 1081) 83.0018 Tj
17.4613 -170.8789 Td
(1501 1685 2521 2522) 83.0018 Tj
-8527.14 TJm
(1685 1690) 39.3166 Tj
0 -180.3723 Td
(SEG_KDATA 1502) 61.1592 Tj
-11035.5 TJm
(STA_W 0566 0670) 65.5277 Tj
17.4613 -189.8653 Td
(1502 1678 1686) 61.1592 Tj
-11035.5 TJm
(0566 0670 0986 1082) 83.0018 Tj
0 -199.3586 Td
(SEG_NULL 0651) 56.7907 Tj
-13543.7 TJm
(1686 1691) 39.3166 Tj
17.4613 -208.852 Td
(0651 1684 1693 1694) 83.0018 Tj
-6520.6 TJm
(STA_X 0563 0667) 65.5277 Tj
0 -218.3453 Td
(SEG_NULLASM 0554) 69.8962 Tj
-12038.7 TJm
(0563 0667 0985 1081) 83.0018 Tj
17.4613 -227.8387 Td
(0554 0984 1080) 61.1592 Tj
-11035.5 TJm
(1685 1690) 39.3166 Tj
0 -237.3321 Td
(SEG_TSS 1505) 52.4222 Tj
-12038.8 TJm
(sti 0470) 34.9481 Tj
17.4613 -246.8254 Td
(1505 1687 1688 1701) 83.0018 Tj
-8527.14 TJm
(0470 0472 1473 1817) 83.0018 Tj
0 -256.3188 Td
(SEG_UCODE 1503) 61.1592 Tj
-11035.5 TJm
(strlen 5389) 48.0537 Tj
17.4613 -265.8121 Td
(1503 1690 1693 1767) 83.0018 Tj
-8527.14 TJm
(0324 5044 5078 5389) 83.0018 Tj
0 -275.3055 Td
(SEG_UDATA 1504) 61.1592 Tj
-13042 TJm
(7019 7223) 39.3166 Tj
17.4613 -284.7989 Td
(1504 1691 1694 1768) 83.0018 Tj
-6520.6 TJm
(strncmp 5351) 52.4222 Tj
0 -294.2922 Td
(SETGATE 0771) 52.4222 Tj
-14045.3 TJm
(0325 4205 5351) 61.1592 Tj
17.4613 -303.7856 Td
(0771 2521 2522) 61.1592 Tj
-9028.94 TJm
(strncpy 5361) 52.4222 Tj
0 -313.2789 Td
(setupsegs 1672) 61.1592 Tj
-13042 TJm
(0326 4272 5361) 61.1592 Tj
17.4613 -322.7723 Td
(0300 1259 1665 1672) 83.0018 Tj
-6520.6 TJm
(STS_IG32 0685) 56.7907 Tj
17.4613 -332.2653 Td
(1830 1837 5106) 61.1592 Tj
-11035.5 TJm
(0685 0777) 39.3166 Tj
0 -341.7586 Td
(SHIFT 6058) 43.6851 Tj
-13042.1 TJm
(STS_T32A 0682) 56.7907 Tj
17.4613 -351.252 Td
(6058 6086 6087 6235) 83.0018 Tj
-8527.14 TJm
(0682 1687) 39.3166 Tj
0 -360.7454 Td
(skipelem 4314) 56.7907 Tj
-11537.1 TJm
(STS_TG32 0686) 56.7907 Tj
17.4613 -370.2387 Td
(4314 4363) 39.3166 Tj
-13543.8 TJm
(0686 0777) 39.3166 Tj
0 -379.7321 Td
(sleep 1903) 43.6851 Tj
-13042.1 TJm
(STUB 6803 6810 6811 6812 6813 6814) 148.5295 Tj
17.4613 -389.2254 Td
(0301 1903 1906 1909) 83.0018 Tj
-8527.14 TJm
(6810 6811 6812 6813) 83.0018 Tj
17.4613 -398.7184 Td
(2090 2109 2877 3480) 83.0018 Tj
-8527.14 TJm
(6814 6815 6816 6817) 83.0018 Tj
17.4613 -408.2114 Td
(3577 3862 5263 5283) 83.0018 Tj
-8527.14 TJm
(6818 6819 6820 6821) 83.0018 Tj
17.4613 -417.7043 Td
(6516 6829) 39.3166 Tj
-13543.8 TJm
(6822 6823 6824 6825) 83.0018 Tj
0 -427.1977 Td
(spinlock 1301) 56.7907 Tj
-13543.7 TJm
(6826 6827 6828 6829) 83.0018 Tj
17.4613 -436.6911 Td
(0206 0301 0311 0313) 83.0018 Tj
-6520.6 TJm
(sum 5525) 34.9481 Tj
17.4613 -446.184 Td
(0314 0315 0343 1301) 83.0018 Tj
-8527.14 TJm
(5525 5527 5529 5531) 83.0018 Tj
17.4613 -455.677 Td
(1358 1363 1375 1402) 83.0018 Tj
-8527.14 TJm
(5532 5543 5592) 61.1592 Tj
17.4613 -465.17 Td
(1440 1606 1608 1903) 83.0018 Tj
-6520.6 TJm
(superblock 3160) 65.5277 Tj
17.4613 -474.663 Td
(2210 2212 2507 2512) 83.0018 Tj
-8527.14 TJm
(3160 3679 3708 3733) 83.0018 Tj
17.4613 -484.1559 Td
(3309 3324 3526 3530) 83.0018 Tj
-8527.14 TJm
(3957) 17.4741 Tj
17.4613 -493.6489 Td
(3668 3784 4404 4408) 83.0018 Tj
-6520.6 TJm
(SVR 5664) 34.9481 Tj
Q
Q
Q
Q
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-612 -792 translate
0 0 612 792 re W
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[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  cross-references  Page 11) 192.2146 Tj
17.4613 -28.4801 Td
(5664 5707) 39.3166 Tj
-11537.3 TJm
(ticks 2513) 43.6851 Tj
0 -37.9735 Td
(swtch 2156) 43.6851 Tj
-15048.7 TJm
(0341 2513 2550 2551) 83.0018 Tj
17.4613 -47.4664 Td
(0308 1832 1864 2155) 83.0018 Tj
-8527.14 TJm
(2871 2872 2877) 61.1592 Tj
17.4613 -56.9598 Td
(2156) 17.4741 Tj
-14045.6 TJm
(tickslock 2512) 61.1592 Tj
0 -66.4531 Td
(syscall 2774) 52.4222 Tj
-14045.3 TJm
(0343 2512 2524 2549) 83.0018 Tj
17.4613 -75.9465 Td
(0334 2540 2656 2774) 83.0018 Tj
-8527.14 TJm
(2552 2870 2874 2877) 83.0018 Tj
0 -85.4399 Td
(SYS_chdir 2616) 61.1592 Tj
-13042 TJm
(2879) 17.4741 Tj
17.4613 -94.9332 Td
(2616 2751) 39.3166 Tj
-11537.3 TJm
(TICR 5683) 39.3166 Tj
0 -104.4266 Td
(SYS_close 2607) 61.1592 Tj
-13042 TJm
(5683 5715) 39.3166 Tj
17.4613 -113.9199 Td
(2607 2752) 39.3166 Tj
-11537.3 TJm
(TIMER 5675) 43.6851 Tj
0 -123.4133 Td
(SYS_dup 2617) 52.4222 Tj
-14045.3 TJm
(5675 5714) 39.3166 Tj
17.4613 -132.9067 Td
(2617 2753) 39.3166 Tj
-11537.3 TJm
(TIMER_16BIT 6621) 69.8962 Tj
0 -142.4 Td
(SYS_exec 2609) 56.7907 Tj
-13543.7 TJm
(6621 6627) 39.3166 Tj
17.4613 -151.8934 Td
(2609 2754 6711) 61.1592 Tj
-9028.94 TJm
(TIMER_DIV 6616) 61.1592 Tj
0 -161.3867 Td
(SYS_exit 2602) 56.7907 Tj
-13543.7 TJm
(6616 6628 6629) 61.1592 Tj
17.4613 -170.8801 Td
(2602 2755 6716) 61.1592 Tj
-9028.94 TJm
(TIMER_FREQ 6615) 65.5277 Tj
0 -180.3735 Td
(SYS_fork 2601) 56.7907 Tj
-13543.7 TJm
(6615 6616) 39.3166 Tj
17.4613 -189.8664 Td
(2601 2756) 39.3166 Tj
-11537.3 TJm
(timer_init 6624) 65.5277 Tj
0 -199.3598 Td
(SYS_fstat 2613) 61.1592 Tj
-13042 TJm
(0337 1234 6624) 61.1592 Tj
17.4613 -208.8532 Td
(2613 2757) 39.3166 Tj
-11537.3 TJm
(TIMER_MODE 6618) 65.5277 Tj
0 -218.3465 Td
(SYS_getpid 2618) 65.5277 Tj
-12540.3 TJm
(6618 6627) 39.3166 Tj
17.4613 -227.8399 Td
(2618 2758) 39.3166 Tj
-11537.3 TJm
(TIMER_RATEGEN 6620) 78.6333 Tj
0 -237.3332 Td
(SYS_kill 2608) 56.7907 Tj
-13543.7 TJm
(6620 6627) 39.3166 Tj
17.4613 -246.8266 Td
(2608 2759) 39.3166 Tj
-11537.3 TJm
(TIMER_SEL0 6619) 65.5277 Tj
0 -256.32 Td
(SYS_link 2614) 56.7907 Tj
-13543.7 TJm
(6619 6627) 39.3166 Tj
17.4613 -265.8133 Td
(2614 2760) 39.3166 Tj
-11537.3 TJm
(TPR 5662) 34.9481 Tj
0 -275.3067 Td
(SYS_mkdir 2615) 61.1592 Tj
-13042 TJm
(5662 5743) 39.3166 Tj
17.4613 -284.8 Td
(2615 2761) 39.3166 Tj
-11537.3 TJm
(trap 2534) 39.3166 Tj
0 -294.2934 Td
(SYS_mknod 2611) 61.1592 Tj
-13042 TJm
(2402 2404 2469 2534) 83.0018 Tj
17.4613 -303.7868 Td
(2611 2762) 39.3166 Tj
-13543.8 TJm
(2573 2575 2578) 61.1592 Tj
0 -313.2801 Td
(SYS_open 2610) 56.7907 Tj
-11537.1 TJm
(trapframe 0477) 61.1592 Tj
17.4613 -322.7735 Td
(2610 2763) 39.3166 Tj
-13543.8 TJm
(0477 1541 1615 1723) 83.0018 Tj
0 -332.2664 Td
(SYS_pipe 2604) 56.7907 Tj
-13543.7 TJm
(2534) 17.4741 Tj
17.4613 -341.7598 Td
(2604 2764) 39.3166 Tj
-11537.3 TJm
(trapret 2474) 52.4222 Tj
0 -351.2532 Td
(SYS_read 2606) 56.7907 Tj
-13543.7 TJm
(2473 2474 2486) 61.1592 Tj
17.4613 -360.7465 Td
(2606 2765) 39.3166 Tj
-11537.3 TJm
(tvinit 2516) 48.0537 Tj
0 -370.2399 Td
(SYS_sbrk 2619) 56.7907 Tj
-13543.7 TJm
(0342 1228 2516) 61.1592 Tj
17.4613 -379.7332 Td
(2619 2766) 39.3166 Tj
-11537.3 TJm
(T_DEV 3184) 43.6851 Tj
0 -389.2266 Td
(SYS_sleep 2620) 61.1592 Tj
-13042 TJm
(3184 4107 4157 4911) 83.0018 Tj
17.4613 -398.72 Td
(2620 2767) 39.3166 Tj
-11537.3 TJm
(T_DIR 3182) 43.6851 Tj
0 -408.2133 Td
(SYS_unlink 2612) 65.5277 Tj
-12540.3 TJm
(3182 4218 4365 4673) 83.0018 Tj
17.4613 -417.7067 Td
(2612 2768) 39.3166 Tj
-13543.8 TJm
(4778 4838 4868 4923) 83.0018 Tj
0 -427.2 Td
(SYS_wait 2603) 56.7907 Tj
-13543.7 TJm
(4938) 17.4741 Tj
17.4613 -436.6934 Td
(2603 2769) 39.3166 Tj
-11537.3 TJm
(T_FILE 3183) 48.0537 Tj
0 -446.1868 Td
(SYS_write 2605) 61.1592 Tj
-13042 TJm
(3183 4862) 39.3166 Tj
17.4613 -455.6801 Td
(2605 2770) 39.3166 Tj
-11537.3 TJm
(T_SYSCALL 2376) 61.1592 Tj
0 -465.1735 Td
(taskstate 0701) 61.1592 Tj
-13042 TJm
(2376 2522 2536 6712) 83.0018 Tj
17.4613 -474.6665 Td
(0701 1561) 39.3166 Tj
-13543.8 TJm
(6717 6807) 39.3166 Tj
0 -484.1598 Td
(TDCR 5685) 39.3166 Tj
-13543.8 TJm
(userinit 1757) 56.7907 Tj
17.4613 -493.6532 Td
(5685 5713) 39.3166 Tj
-13543.8 TJm
(0302 1235 1757) 61.1592 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  cross-references  Page 12) 192.2146 Tj
0 -28.4801 Td
(VER 5661) 34.9481 Tj
-16052 TJm
(6491) 17.4741 Tj
17.4613 -37.9735 Td
(5661 5723) 39.3166 Tj
-11537.3 TJm
(wakeup1 1953) 52.4222 Tj
0 -47.4664 Td
(wait 2053) 39.3166 Tj
-15550.3 TJm
(1953 1968 2026 2033) 83.0018 Tj
17.4613 -56.9598 Td
(0303 2053 2829 6783) 83.0018 Tj
-6520.6 TJm
(writei 4152) 48.0537 Tj
17.4613 -66.4531 Td
(6812 6944 6970 6971) 83.0018 Tj
-8527.14 TJm
(0249 4152 4274 4532) 83.0018 Tj
17.4613 -75.9465 Td
(7026) 17.4741 Tj
-16052.1 TJm
(4785 4786) 39.3166 Tj
0 -85.4399 Td
(waitdisk 1151) 56.7907 Tj
-11537.1 TJm
(xchg 0451) 39.3166 Tj
17.4613 -94.9332 Td
(1151 1163 1172) 61.1592 Tj
-11035.5 TJm
(0451 1260 1384 1415) 83.0018 Tj
0 -104.4266 Td
(wakeup 1965) 48.0537 Tj
-12540.5 TJm
(yield 1869) 43.6851 Tj
17.4613 -113.9199 Td
(0304 1965 2551 3419) 83.0018 Tj
-8527.14 TJm
(0305 1869 2592) 61.1592 Tj
17.4613 -123.4133 Td
(3639 3891 3916 5220) 83.0018 Tj
-6520.6 TJm
(_namei 4354) 48.0537 Tj
17.4613 -132.9067 Td
(5223 5262 5267 5290) 83.0018 Tj
-8527.14 TJm
(4354 4392 4398) 61.1592 Tj
Q
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0 0 612 792 re W
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[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/types.h  Page 1) 166.0035 Tj
0 -28.4801 Td
(0100 typedef unsigned int   uint;) 144.161 Tj
0 -37.9735 Td
(0101 typedef unsigned short ushort;) 152.898 Tj
0 -47.4668 Td
(0102 typedef unsigned char  uchar;) 148.5295 Tj
0 -56.9602 Td
(0103 ) 21.8426 Tj
0 -66.4535 Td
(0104 ) 21.8426 Tj
0 -75.9469 Td
(0105 ) 21.8426 Tj
0 -85.4403 Td
(0106 ) 21.8426 Tj
0 -94.9336 Td
(0107 ) 21.8426 Tj
0 -104.427 Td
(0108 ) 21.8426 Tj
0 -113.9203 Td
(0109 ) 21.8426 Tj
0 -123.4137 Td
(0110 ) 21.8426 Tj
0 -132.9071 Td
(0111 ) 21.8426 Tj
0 -142.4004 Td
(0112 ) 21.8426 Tj
0 -151.8938 Td
(0113 ) 21.8426 Tj
0 -161.3871 Td
(0114 ) 21.8426 Tj
0 -170.8805 Td
(0115 ) 21.8426 Tj
0 -180.3739 Td
(0116 ) 21.8426 Tj
0 -189.8672 Td
(0117 ) 21.8426 Tj
0 -199.3606 Td
(0118 ) 21.8426 Tj
0 -208.8539 Td
(0119 ) 21.8426 Tj
0 -218.3473 Td
(0120 ) 21.8426 Tj
0 -227.8407 Td
(0121 ) 21.8426 Tj
0 -237.334 Td
(0122 ) 21.8426 Tj
0 -246.8274 Td
(0123 ) 21.8426 Tj
0 -256.3207 Td
(0124 ) 21.8426 Tj
0 -265.8141 Td
(0125 ) 21.8426 Tj
0 -275.3075 Td
(0126 ) 21.8426 Tj
0 -284.8008 Td
(0127 ) 21.8426 Tj
0 -294.2942 Td
(0128 ) 21.8426 Tj
0 -303.7875 Td
(0129 ) 21.8426 Tj
0 -313.2809 Td
(0130 ) 21.8426 Tj
0 -322.7743 Td
(0131 ) 21.8426 Tj
0 -332.2676 Td
(0132 ) 21.8426 Tj
0 -341.761 Td
(0133 ) 21.8426 Tj
0 -351.2543 Td
(0134 ) 21.8426 Tj
0 -360.7477 Td
(0135 ) 21.8426 Tj
0 -370.2411 Td
(0136 ) 21.8426 Tj
0 -379.7344 Td
(0137 ) 21.8426 Tj
0 -389.2278 Td
(0138 ) 21.8426 Tj
0 -398.7211 Td
(0139 ) 21.8426 Tj
0 -408.2145 Td
(0140 ) 21.8426 Tj
0 -417.7079 Td
(0141 ) 21.8426 Tj
0 -427.2012 Td
(0142 ) 21.8426 Tj
0 -436.6946 Td
(0143 ) 21.8426 Tj
0 -446.1879 Td
(0144 ) 21.8426 Tj
0 -455.6813 Td
(0145 ) 21.8426 Tj
0 -465.1747 Td
(0146 ) 21.8426 Tj
0 -474.668 Td
(0147 ) 21.8426 Tj
0 -484.1614 Td
(0148 ) 21.8426 Tj
0 -493.6547 Td
(0149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 01) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/param.h  Page 1) 166.0035 Tj
0 -28.4801 Td
(0150 #define NPROC        64  // maximum number of processes) 262.1109 Tj
0 -37.9735 Td
(0151 #define PAGE       4096  // granularity of user-space memo\
ry allocation) 332.0071 Tj
0 -47.4668 Td
(0152 #define KSTACKSIZE PAGE  // size of per-process kernel sta\
ck) 283.9534 Tj
0 -56.9602 Td
(0153 #define NCPU          8  // maximum number of CPUs) 240.2683 Tj
0 -66.4535 Td
(0154 #define NOFILE       16  // open files per process) 240.2683 Tj
0 -75.9469 Td
(0155 #define NFILE       100  // open files per system) 235.8998 Tj
0 -85.4403 Td
(0156 #define NBUF         10  // size of disk block cache) 249.0053 Tj
0 -94.9336 Td
(0157 #define NINODE       50  // maximum number of active i-nod\
es) 283.9534 Tj
0 -104.427 Td
(0158 #define NDEV         10  // maximum major device number) 262.1109 Tj
0 -113.9203 Td
(0159 #define ROOTDEV       1  // device number of file system r\
oot disk) 310.1645 Tj
0 -123.4137 Td
(0160 ) 21.8426 Tj
0 -132.9071 Td
(0161 ) 21.8426 Tj
0 -142.4004 Td
(0162 ) 21.8426 Tj
0 -151.8938 Td
(0163 ) 21.8426 Tj
0 -161.3871 Td
(0164 ) 21.8426 Tj
0 -170.8805 Td
(0165 ) 21.8426 Tj
0 -180.3739 Td
(0166 ) 21.8426 Tj
0 -189.8672 Td
(0167 ) 21.8426 Tj
0 -199.3606 Td
(0168 ) 21.8426 Tj
0 -208.8539 Td
(0169 ) 21.8426 Tj
0 -218.3473 Td
(0170 ) 21.8426 Tj
0 -227.8407 Td
(0171 ) 21.8426 Tj
0 -237.334 Td
(0172 ) 21.8426 Tj
0 -246.8274 Td
(0173 ) 21.8426 Tj
0 -256.3207 Td
(0174 ) 21.8426 Tj
0 -265.8141 Td
(0175 ) 21.8426 Tj
0 -275.3075 Td
(0176 ) 21.8426 Tj
0 -284.8008 Td
(0177 ) 21.8426 Tj
0 -294.2942 Td
(0178 ) 21.8426 Tj
0 -303.7875 Td
(0179 ) 21.8426 Tj
0 -313.2809 Td
(0180 ) 21.8426 Tj
0 -322.7743 Td
(0181 ) 21.8426 Tj
0 -332.2676 Td
(0182 ) 21.8426 Tj
0 -341.761 Td
(0183 ) 21.8426 Tj
0 -351.2543 Td
(0184 ) 21.8426 Tj
0 -360.7477 Td
(0185 ) 21.8426 Tj
0 -370.2411 Td
(0186 ) 21.8426 Tj
0 -379.7344 Td
(0187 ) 21.8426 Tj
0 -389.2278 Td
(0188 ) 21.8426 Tj
0 -398.7211 Td
(0189 ) 21.8426 Tj
0 -408.2145 Td
(0190 ) 21.8426 Tj
0 -417.7079 Td
(0191 ) 21.8426 Tj
0 -427.2012 Td
(0192 ) 21.8426 Tj
0 -436.6946 Td
(0193 ) 21.8426 Tj
0 -446.1879 Td
(0194 ) 21.8426 Tj
0 -455.6813 Td
(0195 ) 21.8426 Tj
0 -465.1747 Td
(0196 ) 21.8426 Tj
0 -474.668 Td
(0197 ) 21.8426 Tj
0 -484.1614 Td
(0198 ) 21.8426 Tj
0 -493.6547 Td
(0199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 01) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 9 9
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/defs.h  Page 1) 161.635 Tj
0 -28.4801 Td
(0200 struct buf;) 69.8962 Tj
0 -37.9735 Td
(0201 struct context;) 87.3703 Tj
0 -47.4668 Td
(0202 struct file;) 74.2647 Tj
0 -56.9602 Td
(0203 struct inode;) 78.6333 Tj
0 -66.4535 Td
(0204 struct pipe;) 74.2647 Tj
0 -75.9469 Td
(0205 struct proc;) 74.2647 Tj
0 -85.4403 Td
(0206 struct spinlock;) 91.7388 Tj
0 -94.9336 Td
(0207 struct stat;) 74.2647 Tj
0 -104.427 Td
(0208 ) 21.8426 Tj
0 -113.9203 Td
(0209 // bio.c) 56.7907 Tj
0 -123.4137 Td
(0210 void            binit\(void\);) 144.161 Tj
0 -132.9071 Td
(0211 struct buf*     bread\(uint, uint\);) 170.3721 Tj
0 -142.4004 Td
(0212 void            brelse\(struct buf*\);) 179.1091 Tj
0 -151.8938 Td
(0213 void            bwrite\(struct buf*\);) 179.1091 Tj
0 -161.3871 Td
(0214 ) 21.8426 Tj
0 -170.8805 Td
(0215 // console.c) 74.2647 Tj
0 -180.3739 Td
(0216 void            console_init\(void\);) 174.7406 Tj
0 -189.8672 Td
(0217 void            cprintf\(char*, ...\);) 179.1091 Tj
0 -199.3606 Td
(0218 void            console_intr\(int\(*\)\(void\)\);) 209.6887 Tj
0 -208.8539 Td
(0219 void            panic\(char*\) __attribute__\(\(noreturn\)\
\);) 262.1109 Tj
0 -218.3473 Td
(0220 ) 21.8426 Tj
0 -227.8407 Td
(0221 // exec.c) 61.1592 Tj
0 -237.334 Td
(0222 int             exec\(char*, char**\);) 179.1091 Tj
0 -246.8274 Td
(0223 ) 21.8426 Tj
0 -256.3207 Td
(0224 // file.c) 61.1592 Tj
0 -265.8141 Td
(0225 struct file*    filealloc\(void\);) 161.635 Tj
0 -275.3075 Td
(0226 void            fileclose\(struct file*\);) 196.5831 Tj
0 -284.8008 Td
(0227 struct file*    filedup\(struct file*\);) 187.8461 Tj
0 -294.2942 Td
(0228 void            fileinit\(void\);) 157.2665 Tj
0 -303.7875 Td
(0229 int             fileread\(struct file*, char*, int n\);) 253.3738 Tj
0 -313.2809 Td
(0230 int             filestat\(struct file*, struct stat*\);) 253.3738 Tj
0 -322.7743 Td
(0231 int             filewrite\(struct file*, char*, int n\);) 257.7424 Tj
0 -332.2676 Td
(0232 ) 21.8426 Tj
0 -341.761 Td
(0233 // fs.c) 52.4222 Tj
0 -351.2543 Td
(0234 int             dirlink\(struct inode*, char*, uint\);) 249.0053 Tj
0 -360.7477 Td
(0235 struct inode*   dirlookup\(struct inode*, char*, uint*\);) 262.1109 Tj
0 -370.2411 Td
(0236 struct inode*   ialloc\(uint, short\);) 179.1091 Tj
0 -379.7344 Td
(0237 struct inode*   idup\(struct inode*\);) 179.1091 Tj
0 -389.2278 Td
(0238 void            iinit\(void\);) 144.161 Tj
0 -398.7211 Td
(0239 void            ilock\(struct inode*\);) 183.4776 Tj
0 -408.2145 Td
(0240 void            iput\(struct inode*\);) 179.1091 Tj
0 -417.7079 Td
(0241 void            iunlock\(struct inode*\);) 192.2146 Tj
0 -427.2012 Td
(0242 void            iunlockput\(struct inode*\);) 205.3202 Tj
0 -436.6946 Td
(0243 void            iupdate\(struct inode*\);) 192.2146 Tj
0 -446.1879 Td
(0244 int             namecmp\(const char*, const char*\);) 240.2683 Tj
0 -455.6813 Td
(0245 struct inode*   namei\(char*\);) 148.5295 Tj
0 -465.1747 Td
(0246 struct inode*   nameiparent\(char*, char*\);) 205.3202 Tj
0 -474.668 Td
(0247 int             readi\(struct inode*, char*, uint, uint\);) 266.4794 Tj
0 -484.1614 Td
(0248 void            stati\(struct inode*, struct stat*\);) 244.6368 Tj
0 -493.6547 Td
(0249 int             writei\(struct inode*, char*, uint, uint\)\
;) 270.8479 Tj
0 -522.1348 Td
(Sheet 02) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/defs.h  Page 2) 161.635 Tj
0 -28.4801 Td
(0250 // ide.c) 56.7907 Tj
0 -37.9735 Td
(0251 void            ide_init\(void\);) 157.2665 Tj
0 -47.4668 Td
(0252 void            ide_intr\(void\);) 157.2665 Tj
0 -56.9602 Td
(0253 void            ide_rw\(struct buf *\);) 183.4776 Tj
0 -66.4535 Td
(0254 ) 21.8426 Tj
0 -75.9469 Td
(0255 // ioapic.c) 69.8962 Tj
0 -85.4403 Td
(0256 void            ioapic_enable\(int irq, int cpu\);) 231.5313 Tj
0 -94.9336 Td
(0257 extern uchar    ioapic_id;) 135.4239 Tj
0 -104.427 Td
(0258 void            ioapic_init\(void\);) 170.3721 Tj
0 -113.9203 Td
(0259 ) 21.8426 Tj
0 -123.4137 Td
(0260 // kalloc.c) 69.8962 Tj
0 -132.9071 Td
(0261 char*           kalloc\(int\);) 144.161 Tj
0 -142.4004 Td
(0262 void            kfree\(char*, int\);) 170.3721 Tj
0 -151.8938 Td
(0263 void            kinit\(void\);) 144.161 Tj
0 -161.3871 Td
(0264 ) 21.8426 Tj
0 -170.8805 Td
(0265 // kbd.c) 56.7907 Tj
0 -180.3739 Td
(0266 void            kbd_intr\(void\);) 157.2665 Tj
0 -189.8672 Td
(0267 ) 21.8426 Tj
0 -199.3606 Td
(0268 // lapic.c) 65.5277 Tj
0 -208.8539 Td
(0269 int             cpu\(void\);) 135.4239 Tj
0 -218.3473 Td
(0270 extern volatile uint*    lapic;) 157.2665 Tj
0 -227.8407 Td
(0271 void            lapic_eoi\(void\);) 161.635 Tj
0 -237.334 Td
(0272 void            lapic_init\(int\);) 161.635 Tj
0 -246.8274 Td
(0273 void            lapic_startap\(uchar, uint\);) 209.6887 Tj
0 -256.3207 Td
(0274 ) 21.8426 Tj
0 -265.8141 Td
(0275 // mp.c) 52.4222 Tj
0 -275.3075 Td
(0276 extern int      ismp;) 113.5814 Tj
0 -284.8008 Td
(0277 int             mp_bcpu\(void\);) 152.898 Tj
0 -294.2942 Td
(0278 void            mp_init\(void\);) 152.898 Tj
0 -303.7875 Td
(0279 void            mp_startthem\(void\);) 174.7406 Tj
0 -313.2809 Td
(0280 ) 21.8426 Tj
0 -322.7743 Td
(0281 // picirq.c) 69.8962 Tj
0 -332.2676 Td
(0282 void            pic_enable\(int\);) 161.635 Tj
0 -341.761 Td
(0283 void            pic_init\(void\);) 157.2665 Tj
0 -351.2543 Td
(0284 ) 21.8426 Tj
0 -360.7477 Td
(0285 // pipe.c) 61.1592 Tj
0 -370.2411 Td
(0286 int             pipealloc\(struct file**, struct file**\);) 266.4794 Tj
0 -379.7344 Td
(0287 void            pipeclose\(struct pipe*, int\);) 218.4257 Tj
0 -389.2278 Td
(0288 int             piperead\(struct pipe*, char*, int\);) 244.6368 Tj
0 -398.7211 Td
(0289 int             pipewrite\(struct pipe*, char*, int\);) 249.0053 Tj
0 -408.2145 Td
(0290 ) 21.8426 Tj
0 -417.7079 Td
(0291 // proc.c) 61.1592 Tj
0 -427.2012 Td
(0292 struct proc*    copyproc\(struct proc*\);) 192.2146 Tj
0 -436.6946 Td
(0293 struct proc*    curproc\(void\);) 152.898 Tj
0 -446.1879 Td
(0294 void            exit\(void\);) 139.7925 Tj
0 -455.6813 Td
(0295 int             growproc\(int\);) 152.898 Tj
0 -465.1747 Td
(0296 int             kill\(int\);) 135.4239 Tj
0 -474.668 Td
(0297 void            pinit\(void\);) 144.161 Tj
0 -484.1614 Td
(0298 void            procdump\(void\);) 157.2665 Tj
0 -493.6547 Td
(0299 void            scheduler\(void\) __attribute__\(\(noretur\
n\)\);) 275.2164 Tj
0 -522.1348 Td
(Sheet 02) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 10 10
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/defs.h  Page 3) 161.635 Tj
0 -28.4801 Td
(0300 void            setupsegs\(struct proc*\);) 196.5831 Tj
0 -37.9735 Td
(0301 void            sleep\(void*, struct spinlock*\);) 227.1628 Tj
0 -47.4668 Td
(0302 void            userinit\(void\);) 157.2665 Tj
0 -56.9602 Td
(0303 int             wait\(void\);) 139.7925 Tj
0 -66.4535 Td
(0304 void            wakeup\(void*\);) 152.898 Tj
0 -75.9469 Td
(0305 void            yield\(void\);) 144.161 Tj
0 -85.4403 Td
(0306 ) 21.8426 Tj
0 -94.9336 Td
(0307 // swtch.S) 65.5277 Tj
0 -104.427 Td
(0308 void            swtch\(struct context*, struct context*\);) 266.4794 Tj
0 -113.9203 Td
(0309 ) 21.8426 Tj
0 -123.4137 Td
(0310 // spinlock.c) 78.6333 Tj
0 -132.9071 Td
(0311 void            acquire\(struct spinlock*\);) 205.3202 Tj
0 -142.4004 Td
(0312 void            getcallerpcs\(void*, uint*\);) 209.6887 Tj
0 -151.8938 Td
(0313 int             holding\(struct spinlock*\);) 205.3202 Tj
0 -161.3871 Td
(0314 void            initlock\(struct spinlock*, char*\);) 240.2683 Tj
0 -170.8805 Td
(0315 void            release\(struct spinlock*\);) 205.3202 Tj
0 -180.3739 Td
(0316 void            pushcli\(\);) 135.4239 Tj
0 -189.8672 Td
(0317 void            popcli\(\);) 131.0554 Tj
0 -199.3606 Td
(0318 ) 21.8426 Tj
0 -208.8539 Td
(0319 // string.c) 69.8962 Tj
0 -218.3473 Td
(0320 int             memcmp\(const void*, const void*, uint\);) 262.1109 Tj
0 -227.8407 Td
(0321 void*           memmove\(void*, const void*, uint\);) 240.2683 Tj
0 -237.334 Td
(0322 void*           memset\(void*, int, uint\);) 200.9517 Tj
0 -246.8274 Td
(0323 char*           safestrcpy\(char*, const char*, int\);) 249.0053 Tj
0 -256.3207 Td
(0324 int             strlen\(const char*\);) 179.1091 Tj
0 -265.8141 Td
(0325 int             strncmp\(const char*, const char*, uint\);) 266.4794 Tj
0 -275.3075 Td
(0326 char*           strncpy\(char*, const char*, int\);) 235.8998 Tj
0 -284.8008 Td
(0327 ) 21.8426 Tj
0 -294.2942 Td
(0328 // syscall.c) 74.2647 Tj
0 -303.7875 Td
(0329 int             argint\(int, int*\);) 170.3721 Tj
0 -313.2809 Td
(0330 int             argptr\(int, char**, int\);) 200.9517 Tj
0 -322.7743 Td
(0331 int             argstr\(int, char**\);) 179.1091 Tj
0 -332.2676 Td
(0332 int             fetchint\(struct proc*, uint, int*\);) 244.6368 Tj
0 -341.761 Td
(0333 int             fetchstr\(struct proc*, uint, char**\);) 253.3738 Tj
0 -351.2543 Td
(0334 void            syscall\(void\);) 152.898 Tj
0 -360.7477 Td
(0335 ) 21.8426 Tj
0 -370.2411 Td
(0336 // timer.c) 65.5277 Tj
0 -379.7344 Td
(0337 void            timer_init\(void\);) 166.0035 Tj
0 -389.2278 Td
(0338 ) 21.8426 Tj
0 -398.7211 Td
(0339 // trap.c) 61.1592 Tj
0 -408.2145 Td
(0340 void            idtinit\(void\);) 152.898 Tj
0 -417.7079 Td
(0341 extern int      ticks;) 117.9499 Tj
0 -427.2012 Td
(0342 void            tvinit\(void\);) 148.5295 Tj
0 -436.6946 Td
(0343 extern struct spinlock tickslock;) 166.0035 Tj
0 -446.1879 Td
(0344 ) 21.8426 Tj
0 -455.6813 Td
(0345 // number of elements in fixed-size array) 200.9517 Tj
0 -465.1747 Td
(0346 #define NELEM\(x\) \(sizeof\(x\)/sizeof\(\(x\)[0]\)\)) 209.6887 Tj
0 -474.668 Td
(0347 ) 21.8426 Tj
0 -484.1614 Td
(0348 ) 21.8426 Tj
0 -493.6547 Td
(0349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 03) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/x86.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0350 // Routines to let C code use special x86 instructions.) 262.1109 Tj
0 -37.9735 Td
(0351 ) 21.8426 Tj
0 -47.4668 Td
(0352 static inline uchar) 104.8443 Tj
0 -56.9602 Td
(0353 inb\(ushort port\)) 91.7388 Tj
0 -66.4535 Td
(0354 {) 26.2111 Tj
0 -75.9469 Td
(0355   uchar data;) 78.6333 Tj
0 -85.4403 Td
(0356 ) 21.8426 Tj
0 -94.9336 Td
(0357   asm volatile\("in %1,%0" : "=a" \(data\) : "d" \(port\)\)\
;) 257.7424 Tj
0 -104.427 Td
(0358   return data;) 83.0018 Tj
0 -113.9203 Td
(0359 }) 26.2111 Tj
0 -123.4137 Td
(0360 ) 21.8426 Tj
0 -132.9071 Td
(0361 static inline void) 100.4758 Tj
0 -142.4004 Td
(0362 insl\(int port, void *addr, int cnt\)) 174.7406 Tj
0 -151.8938 Td
(0363 {) 26.2111 Tj
0 -161.3871 Td
(0364   asm volatile\("cld\\n\\trepne\\n\\tinsl"     :) 209.6887 Tj
0 -170.8805 Td
(0365                    "=D" \(addr\), "=c" \(cnt\)    :) 227.1628 Tj
0 -180.3739 Td
(0366                    "d" \(port\), "0" \(addr\), "1" \(cnt\)\
  :) 262.1109 Tj
0 -189.8672 Td
(0367                    "memory", "cc"\);) 174.7406 Tj
0 -199.3606 Td
(0368 }) 26.2111 Tj
0 -208.8539 Td
(0369 ) 21.8426 Tj
0 -218.3473 Td
(0370 static inline void) 100.4758 Tj
0 -227.8407 Td
(0371 outb\(ushort port, uchar data\)) 148.5295 Tj
0 -237.334 Td
(0372 {) 26.2111 Tj
0 -246.8274 Td
(0373   asm volatile\("out %0,%1" : : "a" \(data\), "d" \(port\)\
\);) 262.1109 Tj
0 -256.3207 Td
(0374 }) 26.2111 Tj
0 -265.8141 Td
(0375 ) 21.8426 Tj
0 -275.3075 Td
(0376 static inline void) 100.4758 Tj
0 -284.8008 Td
(0377 outw\(ushort port, ushort data\)) 152.898 Tj
0 -294.2942 Td
(0378 {) 26.2111 Tj
0 -303.7875 Td
(0379   asm volatile\("out %0,%1" : : "a" \(data\), "d" \(port\)\
\);) 262.1109 Tj
0 -313.2809 Td
(0380 }) 26.2111 Tj
0 -322.7743 Td
(0381 ) 21.8426 Tj
0 -332.2676 Td
(0382 static inline void) 100.4758 Tj
0 -341.761 Td
(0383 outsl\(int port, const void *addr, int cnt\)) 205.3202 Tj
0 -351.2543 Td
(0384 {) 26.2111 Tj
0 -360.7477 Td
(0385   asm volatile\("cld\\n\\trepne\\n\\toutsl"    :) 209.6887 Tj
0 -370.2411 Td
(0386                    "=S" \(addr\), "=c" \(cnt\)    :) 227.1628 Tj
0 -379.7344 Td
(0387                    "d" \(port\), "0" \(addr\), "1" \(cnt\)\
  :) 262.1109 Tj
0 -389.2278 Td
(0388                    "cc"\);) 131.0554 Tj
0 -398.7211 Td
(0389 }) 26.2111 Tj
0 -408.2145 Td
(0390 ) 21.8426 Tj
0 -417.7079 Td
(0391 static inline uint) 100.4758 Tj
0 -427.2012 Td
(0392 read_ebp\(void\)) 83.0018 Tj
0 -436.6946 Td
(0393 {) 26.2111 Tj
0 -446.1879 Td
(0394   uint ebp;) 69.8962 Tj
0 -455.6813 Td
(0395 ) 21.8426 Tj
0 -465.1747 Td
(0396   asm volatile\("movl %%ebp, %0" : "=a" \(ebp\)\);) 222.7942 Tj
0 -474.668 Td
(0397   return ebp;) 78.6333 Tj
0 -484.1614 Td
(0398 }) 26.2111 Tj
0 -493.6547 Td
(0399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 03) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 11 11
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/x86.h  Page 2) 157.2665 Tj
0 -28.4801 Td
(0400 struct segdesc;) 87.3703 Tj
0 -37.9735 Td
(0401 ) 21.8426 Tj
0 -47.4668 Td
(0402 static inline void) 100.4758 Tj
0 -56.9602 Td
(0403 lgdt\(struct segdesc *p, int size\)) 166.0035 Tj
0 -66.4535 Td
(0404 {) 26.2111 Tj
0 -75.9469 Td
(0405   volatile ushort pd[3];) 126.6869 Tj
0 -85.4403 Td
(0406 ) 21.8426 Tj
0 -94.9336 Td
(0407   pd[0] = size-1;) 96.1073 Tj
0 -104.427 Td
(0408   pd[1] = \(uint\)p;) 100.4758 Tj
0 -113.9203 Td
(0409   pd[2] = \(uint\)p >> 16;) 126.6869 Tj
0 -123.4137 Td
(0410 ) 21.8426 Tj
0 -132.9071 Td
(0411   asm volatile\("lgdt \(%0\)" : : "r" \(pd\)\);) 200.9517 Tj
0 -142.4004 Td
(0412 }) 26.2111 Tj
0 -151.8938 Td
(0413 ) 21.8426 Tj
0 -161.3871 Td
(0414 struct gatedesc;) 91.7388 Tj
0 -170.8805 Td
(0415 ) 21.8426 Tj
0 -180.3739 Td
(0416 static inline void) 100.4758 Tj
0 -189.8672 Td
(0417 lidt\(struct gatedesc *p, int size\)) 170.3721 Tj
0 -199.3606 Td
(0418 {) 26.2111 Tj
0 -208.8539 Td
(0419   volatile ushort pd[3];) 126.6869 Tj
0 -218.3473 Td
(0420 ) 21.8426 Tj
0 -227.8407 Td
(0421   pd[0] = size-1;) 96.1073 Tj
0 -237.334 Td
(0422   pd[1] = \(uint\)p;) 100.4758 Tj
0 -246.8274 Td
(0423   pd[2] = \(uint\)p >> 16;) 126.6869 Tj
0 -256.3207 Td
(0424 ) 21.8426 Tj
0 -265.8141 Td
(0425   asm volatile\("lidt \(%0\)" : : "r" \(pd\)\);) 200.9517 Tj
0 -275.3075 Td
(0426 }) 26.2111 Tj
0 -284.8008 Td
(0427 ) 21.8426 Tj
0 -294.2942 Td
(0428 static inline void) 100.4758 Tj
0 -303.7875 Td
(0429 ltr\(ushort sel\)) 87.3703 Tj
0 -313.2809 Td
(0430 {) 26.2111 Tj
0 -322.7743 Td
(0431   asm volatile\("ltr %0" : : "r" \(sel\)\);) 192.2146 Tj
0 -332.2676 Td
(0432 }) 26.2111 Tj
0 -341.761 Td
(0433 ) 21.8426 Tj
0 -351.2543 Td
(0434 static inline uint) 100.4758 Tj
0 -360.7477 Td
(0435 read_eflags\(void\)) 96.1073 Tj
0 -370.2411 Td
(0436 {) 26.2111 Tj
0 -379.7344 Td
(0437   uint eflags;) 83.0018 Tj
0 -389.2278 Td
(0438   asm volatile\("pushfl; popl %0" : "=r" \(eflags\)\);) 240.2683 Tj
0 -398.7211 Td
(0439   return eflags;) 91.7388 Tj
0 -408.2145 Td
(0440 }) 26.2111 Tj
0 -417.7079 Td
(0441 ) 21.8426 Tj
0 -427.2012 Td
(0442 static inline void) 100.4758 Tj
0 -436.6946 Td
(0443 write_eflags\(uint eflags\)) 131.0554 Tj
0 -446.1879 Td
(0444 {) 26.2111 Tj
0 -455.6813 Td
(0445   asm volatile\("pushl %0; popfl" : : "r" \(eflags\)\);) 244.6368 Tj
0 -465.1747 Td
(0446 }) 26.2111 Tj
0 -474.668 Td
(0447 ) 21.8426 Tj
0 -484.1614 Td
(0448 ) 21.8426 Tj
0 -493.6547 Td
(0449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 04) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/x86.h  Page 3) 157.2665 Tj
0 -28.4801 Td
(0450 static inline uint) 100.4758 Tj
0 -37.9735 Td
(0451 xchg\(volatile uint *addr, uint newval\)) 187.8461 Tj
0 -47.4668 Td
(0452 {) 26.2111 Tj
0 -56.9602 Td
(0453   uint result;) 83.0018 Tj
0 -66.4535 Td
(0454 ) 21.8426 Tj
0 -75.9469 Td
(0455   // The + in "+m" denotes a read-modify-write operand.) 262.1109 Tj
0 -85.4403 Td
(0456   asm volatile\("lock; xchgl %0, %1" :) 183.4776 Tj
0 -94.9336 Td
(0457                "+m" \(*addr\), "=a" \(result\) :) 214.0572 Tj
0 -104.427 Td
(0458                "1" \(newval\) :) 148.5295 Tj
0 -113.9203 Td
(0459                "cc"\);) 113.5814 Tj
0 -123.4137 Td
(0460   return result;) 91.7388 Tj
0 -132.9071 Td
(0461 }) 26.2111 Tj
0 -142.4004 Td
(0462 ) 21.8426 Tj
0 -151.8938 Td
(0463 static inline void) 100.4758 Tj
0 -161.3871 Td
(0464 cli\(void\)) 61.1592 Tj
0 -170.8805 Td
(0465 {) 26.2111 Tj
0 -180.3739 Td
(0466   asm volatile\("cli"\);) 117.9499 Tj
0 -189.8672 Td
(0467 }) 26.2111 Tj
0 -199.3606 Td
(0468 ) 21.8426 Tj
0 -208.8539 Td
(0469 static inline void) 100.4758 Tj
0 -218.3473 Td
(0470 sti\(void\)) 61.1592 Tj
0 -227.8407 Td
(0471 {) 26.2111 Tj
0 -237.334 Td
(0472   asm volatile\("sti"\);) 117.9499 Tj
0 -246.8274 Td
(0473 }) 26.2111 Tj
0 -256.3207 Td
(0474 ) 21.8426 Tj
0 -265.8141 Td
(0475 // Layout of the trap frame built on the stack by the) 253.3738 Tj
0 -275.3075 Td
(0476 // hardware and by trapasm.S, and passed to trap\(\).) 244.6368 Tj
0 -284.8008 Td
(0477 struct trapframe {) 100.4758 Tj
0 -294.2942 Td
(0478   // registers as pushed by pusha) 166.0035 Tj
0 -303.7875 Td
(0479   uint edi;) 69.8962 Tj
0 -313.2809 Td
(0480   uint esi;) 69.8962 Tj
0 -322.7743 Td
(0481   uint ebp;) 69.8962 Tj
0 -332.2676 Td
(0482   uint oesp;      // useless & ignored) 187.8461 Tj
0 -341.761 Td
(0483   uint ebx;) 69.8962 Tj
0 -351.2543 Td
(0484   uint edx;) 69.8962 Tj
0 -360.7477 Td
(0485   uint ecx;) 69.8962 Tj
0 -370.2411 Td
(0486   uint eax;) 69.8962 Tj
0 -379.7344 Td
(0487 ) 21.8426 Tj
0 -389.2278 Td
(0488   // rest of trap frame) 122.3184 Tj
0 -398.7211 Td
(0489   ushort es;) 74.2647 Tj
0 -408.2145 Td
(0490   ushort padding1;) 100.4758 Tj
0 -417.7079 Td
(0491   ushort ds;) 74.2647 Tj
0 -427.2012 Td
(0492   ushort padding2;) 100.4758 Tj
0 -436.6946 Td
(0493   uint trapno;) 83.0018 Tj
0 -446.1879 Td
(0494 ) 21.8426 Tj
0 -455.6813 Td
(0495   // below here defined by x86 hardware) 192.2146 Tj
0 -465.1747 Td
(0496   uint err;) 69.8962 Tj
0 -474.668 Td
(0497   uint eip;) 69.8962 Tj
0 -484.1614 Td
(0498   ushort cs;) 74.2647 Tj
0 -493.6547 Td
(0499   ushort padding3;) 100.4758 Tj
0 -522.1348 Td
(Sheet 04) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 12 12
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/x86.h  Page 4) 157.2665 Tj
0 -28.4801 Td
(0500   uint eflags;) 83.0018 Tj
0 -37.9735 Td
(0501 ) 21.8426 Tj
0 -47.4668 Td
(0502   // below here only when crossing rings, such as from use\
r to kernel) 323.2701 Tj
0 -56.9602 Td
(0503   uint esp;) 69.8962 Tj
0 -66.4535 Td
(0504   ushort ss;) 74.2647 Tj
0 -75.9469 Td
(0505   ushort padding4;) 100.4758 Tj
0 -85.4403 Td
(0506 };) 30.5796 Tj
0 -94.9336 Td
(0507 ) 21.8426 Tj
0 -104.427 Td
(0508 ) 21.8426 Tj
0 -113.9203 Td
(0509 ) 21.8426 Tj
0 -123.4137 Td
(0510 ) 21.8426 Tj
0 -132.9071 Td
(0511 ) 21.8426 Tj
0 -142.4004 Td
(0512 ) 21.8426 Tj
0 -151.8938 Td
(0513 ) 21.8426 Tj
0 -161.3871 Td
(0514 ) 21.8426 Tj
0 -170.8805 Td
(0515 ) 21.8426 Tj
0 -180.3739 Td
(0516 ) 21.8426 Tj
0 -189.8672 Td
(0517 ) 21.8426 Tj
0 -199.3606 Td
(0518 ) 21.8426 Tj
0 -208.8539 Td
(0519 ) 21.8426 Tj
0 -218.3473 Td
(0520 ) 21.8426 Tj
0 -227.8407 Td
(0521 ) 21.8426 Tj
0 -237.334 Td
(0522 ) 21.8426 Tj
0 -246.8274 Td
(0523 ) 21.8426 Tj
0 -256.3207 Td
(0524 ) 21.8426 Tj
0 -265.8141 Td
(0525 ) 21.8426 Tj
0 -275.3075 Td
(0526 ) 21.8426 Tj
0 -284.8008 Td
(0527 ) 21.8426 Tj
0 -294.2942 Td
(0528 ) 21.8426 Tj
0 -303.7875 Td
(0529 ) 21.8426 Tj
0 -313.2809 Td
(0530 ) 21.8426 Tj
0 -322.7743 Td
(0531 ) 21.8426 Tj
0 -332.2676 Td
(0532 ) 21.8426 Tj
0 -341.761 Td
(0533 ) 21.8426 Tj
0 -351.2543 Td
(0534 ) 21.8426 Tj
0 -360.7477 Td
(0535 ) 21.8426 Tj
0 -370.2411 Td
(0536 ) 21.8426 Tj
0 -379.7344 Td
(0537 ) 21.8426 Tj
0 -389.2278 Td
(0538 ) 21.8426 Tj
0 -398.7211 Td
(0539 ) 21.8426 Tj
0 -408.2145 Td
(0540 ) 21.8426 Tj
0 -417.7079 Td
(0541 ) 21.8426 Tj
0 -427.2012 Td
(0542 ) 21.8426 Tj
0 -436.6946 Td
(0543 ) 21.8426 Tj
0 -446.1879 Td
(0544 ) 21.8426 Tj
0 -455.6813 Td
(0545 ) 21.8426 Tj
0 -465.1747 Td
(0546 ) 21.8426 Tj
0 -474.668 Td
(0547 ) 21.8426 Tj
0 -484.1614 Td
(0548 ) 21.8426 Tj
0 -493.6547 Td
(0549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 05) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/asm.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0550 //) 30.5796 Tj
0 -37.9735 Td
(0551 // assembler macros to create x86 segments) 205.3202 Tj
0 -47.4668 Td
(0552 //) 30.5796 Tj
0 -56.9602 Td
(0553 ) 21.8426 Tj
0 -66.4535 Td
(0554 #define SEG_NULLASM                                       \
      \\) 305.796 Tj
0 -75.9469 Td
(0555         .word 0, 0;                                       \
      \\) 305.796 Tj
0 -85.4403 Td
(0556         .byte 0, 0, 0, 0) 126.6869 Tj
0 -94.9336 Td
(0557 ) 21.8426 Tj
0 -104.427 Td
(0558 #define SEG_ASM\(type,base,lim\)                          \
        \\) 305.796 Tj
0 -113.9203 Td
(0559         .word \(\(\(lim\) >> 12\) & 0xffff\), \(\(base\) &\
 0xffff\);      \\) 305.796 Tj
0 -123.4137 Td
(0560         .byte \(\(\(base\) >> 16\) & 0xff\), \(0x90 | \(ty\
pe\)\),         \\) 305.796 Tj
0 -132.9071 Td
(0561                 \(0xC0 | \(\(\(lim\) >> 28\) & 0xf\)\), \(\
\(\(base\) >> 24\) & 0xff\)) 332.0071 Tj
0 -142.4004 Td
(0562 ) 21.8426 Tj
0 -151.8938 Td
(0563 #define STA_X     0x8       // Executable segment) 235.8998 Tj
0 -161.3871 Td
(0564 #define STA_E     0x4       // Expand down \(non-executabl\
e segments\)) 318.9016 Tj
0 -170.8805 Td
(0565 #define STA_C     0x4       // Conforming code segment \(e\
xecutable only\)) 336.3756 Tj
0 -180.3739 Td
(0566 #define STA_W     0x2       // Writeable \(non-executable \
segments\)) 310.1645 Tj
0 -189.8672 Td
(0567 #define STA_R     0x2       // Readable \(executable segme\
nts\)) 288.322 Tj
0 -199.3606 Td
(0568 #define STA_A     0x1       // Accessed) 192.2146 Tj
0 -208.8539 Td
(0569 ) 21.8426 Tj
0 -218.3473 Td
(0570 ) 21.8426 Tj
0 -227.8407 Td
(0571 ) 21.8426 Tj
0 -237.334 Td
(0572 ) 21.8426 Tj
0 -246.8274 Td
(0573 ) 21.8426 Tj
0 -256.3207 Td
(0574 ) 21.8426 Tj
0 -265.8141 Td
(0575 ) 21.8426 Tj
0 -275.3075 Td
(0576 ) 21.8426 Tj
0 -284.8008 Td
(0577 ) 21.8426 Tj
0 -294.2942 Td
(0578 ) 21.8426 Tj
0 -303.7875 Td
(0579 ) 21.8426 Tj
0 -313.2809 Td
(0580 ) 21.8426 Tj
0 -322.7743 Td
(0581 ) 21.8426 Tj
0 -332.2676 Td
(0582 ) 21.8426 Tj
0 -341.761 Td
(0583 ) 21.8426 Tj
0 -351.2543 Td
(0584 ) 21.8426 Tj
0 -360.7477 Td
(0585 ) 21.8426 Tj
0 -370.2411 Td
(0586 ) 21.8426 Tj
0 -379.7344 Td
(0587 ) 21.8426 Tj
0 -389.2278 Td
(0588 ) 21.8426 Tj
0 -398.7211 Td
(0589 ) 21.8426 Tj
0 -408.2145 Td
(0590 ) 21.8426 Tj
0 -417.7079 Td
(0591 ) 21.8426 Tj
0 -427.2012 Td
(0592 ) 21.8426 Tj
0 -436.6946 Td
(0593 ) 21.8426 Tj
0 -446.1879 Td
(0594 ) 21.8426 Tj
0 -455.6813 Td
(0595 ) 21.8426 Tj
0 -465.1747 Td
(0596 ) 21.8426 Tj
0 -474.668 Td
(0597 ) 21.8426 Tj
0 -484.1614 Td
(0598 ) 21.8426 Tj
0 -493.6547 Td
(0599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 05) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 13 13
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/mmu.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0600 // This file contains definitions for the) 200.9517 Tj
0 -37.9735 Td
(0601 // x86 memory management unit \(MMU\).) 179.1091 Tj
0 -47.4668 Td
(0602 ) 21.8426 Tj
0 -56.9602 Td
(0603 // Eflags register) 100.4758 Tj
0 -66.4535 Td
(0604 #define FL_CF           0x00000001      // Carry Flag) 253.3738 Tj
0 -75.9469 Td
(0605 #define FL_PF           0x00000004      // Parity Flag) 257.7424 Tj
0 -85.4403 Td
(0606 #define FL_AF           0x00000010      // Auxiliary carry\
 Flag) 297.059 Tj
0 -94.9336 Td
(0607 #define FL_ZF           0x00000040      // Zero Flag) 249.0053 Tj
0 -104.427 Td
(0608 #define FL_SF           0x00000080      // Sign Flag) 249.0053 Tj
0 -113.9203 Td
(0609 #define FL_TF           0x00000100      // Trap Flag) 249.0053 Tj
0 -123.4137 Td
(0610 #define FL_IF           0x00000200      // Interrupt Enabl\
e) 279.5849 Tj
0 -132.9071 Td
(0611 #define FL_DF           0x00000400      // Direction Flag) 270.8479 Tj
0 -142.4004 Td
(0612 #define FL_OF           0x00000800      // Overflow Flag) 266.4794 Tj
0 -151.8938 Td
(0613 #define FL_IOPL_MASK    0x00003000      // I/O Privilege L\
evel bitmask) 327.6386 Tj
0 -161.3871 Td
(0614 #define FL_IOPL_0       0x00000000      //   IOPL == 0) 257.7424 Tj
0 -170.8805 Td
(0615 #define FL_IOPL_1       0x00001000      //   IOPL == 1) 257.7424 Tj
0 -180.3739 Td
(0616 #define FL_IOPL_2       0x00002000      //   IOPL == 2) 257.7424 Tj
0 -189.8672 Td
(0617 #define FL_IOPL_3       0x00003000      //   IOPL == 3) 257.7424 Tj
0 -199.3606 Td
(0618 #define FL_NT           0x00004000      // Nested Task) 257.7424 Tj
0 -208.8539 Td
(0619 #define FL_RF           0x00010000      // Resume Flag) 257.7424 Tj
0 -218.3473 Td
(0620 #define FL_VM           0x00020000      // Virtual 8086 mo\
de) 283.9534 Tj
0 -227.8407 Td
(0621 #define FL_AC           0x00040000      // Alignment Check) 275.2164 Tj
0 -237.334 Td
(0622 #define FL_VIF          0x00080000      // Virtual Interru\
pt Flag) 305.796 Tj
0 -246.8274 Td
(0623 #define FL_VIP          0x00100000      // Virtual Interru\
pt Pending) 318.9016 Tj
0 -256.3207 Td
(0624 #define FL_ID           0x00200000      // ID flag) 240.2683 Tj
0 -265.8141 Td
(0625 ) 21.8426 Tj
0 -275.3075 Td
(0626 // Segment Descriptor) 113.5814 Tj
0 -284.8008 Td
(0627 struct segdesc {) 91.7388 Tj
0 -294.2942 Td
(0628   uint lim_15_0 : 16;  // Low bits of segment limit) 244.6368 Tj
0 -303.7875 Td
(0629   uint base_15_0 : 16; // Low bits of segment base address) 275.2164 Tj
0 -313.2809 Td
(0630   uint base_23_16 : 8; // Middle bits of segment base addr\
ess) 288.322 Tj
0 -322.7743 Td
(0631   uint type : 4;       // Segment type \(see STS_ constant\
s\)) 279.5849 Tj
0 -332.2676 Td
(0632   uint s : 1;          // 0 = system, 1 = application) 253.3738 Tj
0 -341.761 Td
(0633   uint dpl : 2;        // Descriptor Privilege Level) 249.0053 Tj
0 -351.2543 Td
(0634   uint p : 1;          // Present) 166.0035 Tj
0 -360.7477 Td
(0635   uint lim_19_16 : 4;  // High bits of segment limit) 249.0053 Tj
0 -370.2411 Td
(0636   uint avl : 1;        // Unused \(available for software \
use\)) 288.322 Tj
0 -379.7344 Td
(0637   uint rsv1 : 1;       // Reserved) 170.3721 Tj
0 -389.2278 Td
(0638   uint db : 1;         // 0 = 16-bit segment, 1 = 32-bit s\
egment) 301.4275 Tj
0 -398.7211 Td
(0639   uint g : 1;          // Granularity: limit scaled by 4K \
when set) 310.1645 Tj
0 -408.2145 Td
(0640   uint base_31_24 : 8; // High bits of segment base addres\
s) 279.5849 Tj
0 -417.7079 Td
(0641 };) 30.5796 Tj
0 -427.2012 Td
(0642 ) 21.8426 Tj
0 -436.6946 Td
(0643 ) 21.8426 Tj
0 -446.1879 Td
(0644 ) 21.8426 Tj
0 -455.6813 Td
(0645 ) 21.8426 Tj
0 -465.1747 Td
(0646 ) 21.8426 Tj
0 -474.668 Td
(0647 ) 21.8426 Tj
0 -484.1614 Td
(0648 ) 21.8426 Tj
0 -493.6547 Td
(0649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 06) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/mmu.h  Page 2) 157.2665 Tj
0 -28.4801 Td
(0650 // Null segment) 87.3703 Tj
0 -37.9735 Td
(0651 #define SEG_NULL        \(struct segdesc\){ 0,0,0,0,0,0,0,\
0,0,0,0,0,0 }) 323.2701 Tj
0 -47.4668 Td
(0652 ) 21.8426 Tj
0 -56.9602 Td
(0653 // Normal segment) 96.1073 Tj
0 -66.4535 Td
(0654 #define SEG\(type, base, lim, dpl\) \(struct segdesc\)    \
                  \\) 340.7441 Tj
0 -75.9469 Td
(0655 { \(\(lim\) >> 12\) & 0xffff, \(base\) & 0xffff, \(\(base\)\
 >> 16\) & 0xff,       \\) 340.7441 Tj
0 -85.4403 Td
(0656     type, 1, dpl, 1, \(uint\) \(lim\) >> 28, 0, 0, 1, 1,  \
                  \\) 340.7441 Tj
0 -94.9336 Td
(0657     \(uint\) \(base\) >> 24 }) 131.0554 Tj
0 -104.427 Td
(0658 ) 21.8426 Tj
0 -113.9203 Td
(0659 #define SEG16\(type, base, lim, dpl\) \(struct segdesc\)  \
                  \\) 340.7441 Tj
0 -123.4137 Td
(0660 { \(lim\) & 0xffff, \(base\) & 0xffff, \(\(base\) >> 16\) \
& 0xff,               \\) 340.7441 Tj
0 -132.9071 Td
(0661     type, 1, dpl, 1, \(uint\) \(lim\) >> 16, 0, 0, 1, 0,  \
                  \\) 340.7441 Tj
0 -142.4004 Td
(0662     \(uint\) \(base\) >> 24 }) 131.0554 Tj
0 -151.8938 Td
(0663 ) 21.8426 Tj
0 -161.3871 Td
(0664 #define DPL_USER    0x3     // User DPL) 192.2146 Tj
0 -170.8805 Td
(0665 ) 21.8426 Tj
0 -180.3739 Td
(0666 // Application segment type bits) 161.635 Tj
0 -189.8672 Td
(0667 #define STA_X       0x8     // Executable segment) 235.8998 Tj
0 -199.3606 Td
(0668 #define STA_E       0x4     // Expand down \(non-executabl\
e segments\)) 318.9016 Tj
0 -208.8539 Td
(0669 #define STA_C       0x4     // Conforming code segment \(e\
xecutable only\)) 336.3756 Tj
0 -218.3473 Td
(0670 #define STA_W       0x2     // Writeable \(non-executable \
segments\)) 310.1645 Tj
0 -227.8407 Td
(0671 #define STA_R       0x2     // Readable \(executable segme\
nts\)) 288.322 Tj
0 -237.334 Td
(0672 #define STA_A       0x1     // Accessed) 192.2146 Tj
0 -246.8274 Td
(0673 ) 21.8426 Tj
0 -256.3207 Td
(0674 // System segment type bits) 139.7925 Tj
0 -265.8141 Td
(0675 #define STS_T16A    0x1     // Available 16-bit TSS) 244.6368 Tj
0 -275.3075 Td
(0676 #define STS_LDT     0x2     // Local Descriptor Table) 253.3738 Tj
0 -284.8008 Td
(0677 #define STS_T16B    0x3     // Busy 16-bit TSS) 222.7942 Tj
0 -294.2942 Td
(0678 #define STS_CG16    0x4     // 16-bit Call Gate) 227.1628 Tj
0 -303.7875 Td
(0679 #define STS_TG      0x5     // Task Gate / Coum Transmitio\
ns) 283.9534 Tj
0 -313.2809 Td
(0680 #define STS_IG16    0x6     // 16-bit Interrupt Gate) 249.0053 Tj
0 -322.7743 Td
(0681 #define STS_TG16    0x7     // 16-bit Trap Gate) 227.1628 Tj
0 -332.2676 Td
(0682 #define STS_T32A    0x9     // Available 32-bit TSS) 244.6368 Tj
0 -341.761 Td
(0683 #define STS_T32B    0xB     // Busy 32-bit TSS) 222.7942 Tj
0 -351.2543 Td
(0684 #define STS_CG32    0xC     // 32-bit Call Gate) 227.1628 Tj
0 -360.7477 Td
(0685 #define STS_IG32    0xE     // 32-bit Interrupt Gate) 249.0053 Tj
0 -370.2411 Td
(0686 #define STS_TG32    0xF     // 32-bit Trap Gate) 227.1628 Tj
0 -379.7344 Td
(0687 ) 21.8426 Tj
0 -389.2278 Td
(0688 ) 21.8426 Tj
0 -398.7211 Td
(0689 ) 21.8426 Tj
0 -408.2145 Td
(0690 ) 21.8426 Tj
0 -417.7079 Td
(0691 ) 21.8426 Tj
0 -427.2012 Td
(0692 ) 21.8426 Tj
0 -436.6946 Td
(0693 ) 21.8426 Tj
0 -446.1879 Td
(0694 ) 21.8426 Tj
0 -455.6813 Td
(0695 ) 21.8426 Tj
0 -465.1747 Td
(0696 ) 21.8426 Tj
0 -474.668 Td
(0697 ) 21.8426 Tj
0 -484.1614 Td
(0698 ) 21.8426 Tj
0 -493.6547 Td
(0699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 06) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 14 14
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/mmu.h  Page 3) 157.2665 Tj
0 -28.4801 Td
(0700 // Task state segment format) 144.161 Tj
0 -37.9735 Td
(0701 struct taskstate {) 100.4758 Tj
0 -47.4668 Td
(0702   uint link;         // Old ts selector) 192.2146 Tj
0 -56.9602 Td
(0703   uint esp0;         // Stack pointers and segment selecto\
rs) 283.9534 Tj
0 -66.4535 Td
(0704   ushort ss0;        //   after an increase in privilege l\
evel) 292.6905 Tj
0 -75.9469 Td
(0705   ushort padding1;) 100.4758 Tj
0 -85.4403 Td
(0706   uint *esp1;) 78.6333 Tj
0 -94.9336 Td
(0707   ushort ss1;) 78.6333 Tj
0 -104.427 Td
(0708   ushort padding2;) 100.4758 Tj
0 -113.9203 Td
(0709   uint *esp2;) 78.6333 Tj
0 -123.4137 Td
(0710   ushort ss2;) 78.6333 Tj
0 -132.9071 Td
(0711   ushort padding3;) 100.4758 Tj
0 -142.4004 Td
(0712   void *cr3;         // Page directory base) 209.6887 Tj
0 -151.8938 Td
(0713   uint *eip;         // Saved state from last task switch) 270.8479 Tj
0 -161.3871 Td
(0714   uint eflags;) 83.0018 Tj
0 -170.8805 Td
(0715   uint eax;          // More saved state \(registers\)) 249.0053 Tj
0 -180.3739 Td
(0716   uint ecx;) 69.8962 Tj
0 -189.8672 Td
(0717   uint edx;) 69.8962 Tj
0 -199.3606 Td
(0718   uint ebx;) 69.8962 Tj
0 -208.8539 Td
(0719   uint *esp;) 74.2647 Tj
0 -218.3473 Td
(0720   uint *ebp;) 74.2647 Tj
0 -227.8407 Td
(0721   uint esi;) 69.8962 Tj
0 -237.334 Td
(0722   uint edi;) 69.8962 Tj
0 -246.8274 Td
(0723   ushort es;         // Even more saved state \(segment se\
lectors\)) 305.796 Tj
0 -256.3207 Td
(0724   ushort padding4;) 100.4758 Tj
0 -265.8141 Td
(0725   ushort cs;) 74.2647 Tj
0 -275.3075 Td
(0726   ushort padding5;) 100.4758 Tj
0 -284.8008 Td
(0727   ushort ss;) 74.2647 Tj
0 -294.2942 Td
(0728   ushort padding6;) 100.4758 Tj
0 -303.7875 Td
(0729   ushort ds;) 74.2647 Tj
0 -313.2809 Td
(0730   ushort padding7;) 100.4758 Tj
0 -322.7743 Td
(0731   ushort fs;) 74.2647 Tj
0 -332.2676 Td
(0732   ushort padding8;) 100.4758 Tj
0 -341.761 Td
(0733   ushort gs;) 74.2647 Tj
0 -351.2543 Td
(0734   ushort padding9;) 100.4758 Tj
0 -360.7477 Td
(0735   ushort ldt;) 78.6333 Tj
0 -370.2411 Td
(0736   ushort padding10;) 104.8443 Tj
0 -379.7344 Td
(0737   ushort t;          // Trap on task switch) 209.6887 Tj
0 -389.2278 Td
(0738   ushort iomb;       // I/O map base address) 214.0572 Tj
0 -398.7211 Td
(0739 };) 30.5796 Tj
0 -408.2145 Td
(0740 ) 21.8426 Tj
0 -417.7079 Td
(0741 ) 21.8426 Tj
0 -427.2012 Td
(0742 ) 21.8426 Tj
0 -436.6946 Td
(0743 ) 21.8426 Tj
0 -446.1879 Td
(0744 ) 21.8426 Tj
0 -455.6813 Td
(0745 ) 21.8426 Tj
0 -465.1747 Td
(0746 ) 21.8426 Tj
0 -474.668 Td
(0747 ) 21.8426 Tj
0 -484.1614 Td
(0748 ) 21.8426 Tj
0 -493.6547 Td
(0749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 07) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/mmu.h  Page 4) 157.2665 Tj
0 -28.4801 Td
(0750 // Gate descriptors for interrupts and traps) 214.0572 Tj
0 -37.9735 Td
(0751 struct gatedesc {) 96.1073 Tj
0 -47.4668 Td
(0752   uint off_15_0 : 16;   // low 16 bits of offset in segmen\
t) 279.5849 Tj
0 -56.9602 Td
(0753   uint cs : 16;         // code segment selector) 231.5313 Tj
0 -66.4535 Td
(0754   uint args : 5;        // # args, 0 for interrupt/trap ga\
tes) 288.322 Tj
0 -75.9469 Td
(0755   uint rsv1 : 3;        // reserved\(should be zero I gues\
s\)) 279.5849 Tj
0 -85.4403 Td
(0756   uint type : 4;        // type\(STS_{TG,IG32,TG32}\)) 244.6368 Tj
0 -94.9336 Td
(0757   uint s : 1;           // must be 0 \(system\)) 218.4257 Tj
0 -104.427 Td
(0758   uint dpl : 2;         // descriptor\(meaning new\) privi\
lege level) 310.1645 Tj
0 -113.9203 Td
(0759   uint p : 1;           // Present) 170.3721 Tj
0 -123.4137 Td
(0760   uint off_31_16 : 16;  // high bits of offset in segment) 270.8479 Tj
0 -132.9071 Td
(0761 };) 30.5796 Tj
0 -142.4004 Td
(0762 ) 21.8426 Tj
0 -151.8938 Td
(0763 // Set up a normal interrupt/trap gate descriptor.) 240.2683 Tj
0 -161.3871 Td
(0764 // - istrap: 1 for a trap \(= exception\) gate, 0 for an i\
nterrupt gate.) 327.6386 Tj
0 -170.8805 Td
(0765 //   interrupt gate clears FL_IF, trap gate leaves FL_IF a\
lone) 292.6905 Tj
0 -180.3739 Td
(0766 // - sel: Code segment selector for interrupt/trap handler) 275.2164 Tj
0 -189.8672 Td
(0767 // - off: Offset in code segment for interrupt/trap handle\
r) 279.5849 Tj
0 -199.3606 Td
(0768 // - dpl: Descriptor Privilege Level -) 187.8461 Tj
0 -208.8539 Td
(0769 //        the privilege level required for software to inv\
oke) 288.322 Tj
0 -218.3473 Td
(0770 //        this interrupt/trap gate explicitly using an int\
 instruction.) 332.0071 Tj
0 -227.8407 Td
(0771 #define SETGATE\(gate, istrap, sel, off, d\)              \
  \\) 279.5849 Tj
0 -237.334 Td
(0772 {                                                         \
\\) 279.5849 Tj
0 -246.8274 Td
(0773   \(gate\).off_15_0 = \(uint\) \(off\) & 0xffff;          \
      \\) 279.5849 Tj
0 -256.3207 Td
(0774   \(gate\).cs = \(sel\);                                  \
    \\) 279.5849 Tj
0 -265.8141 Td
(0775   \(gate\).args = 0;                                      \
  \\) 279.5849 Tj
0 -275.3075 Td
(0776   \(gate\).rsv1 = 0;                                      \
  \\) 279.5849 Tj
0 -284.8008 Td
(0777   \(gate\).type = \(istrap\) ? STS_TG32 : STS_IG32;       \
    \\) 279.5849 Tj
0 -294.2942 Td
(0778   \(gate\).s = 0;                                         \
  \\) 279.5849 Tj
0 -303.7875 Td
(0779   \(gate\).dpl = \(d\);                                   \
    \\) 279.5849 Tj
0 -313.2809 Td
(0780   \(gate\).p = 1;                                         \
  \\) 279.5849 Tj
0 -322.7743 Td
(0781   \(gate\).off_31_16 = \(uint\) \(off\) >> 16;            \
      \\) 279.5849 Tj
0 -332.2676 Td
(0782 }) 26.2111 Tj
0 -341.761 Td
(0783 ) 21.8426 Tj
0 -351.2543 Td
(0784 ) 21.8426 Tj
0 -360.7477 Td
(0785 ) 21.8426 Tj
0 -370.2411 Td
(0786 ) 21.8426 Tj
0 -379.7344 Td
(0787 ) 21.8426 Tj
0 -389.2278 Td
(0788 ) 21.8426 Tj
0 -398.7211 Td
(0789 ) 21.8426 Tj
0 -408.2145 Td
(0790 ) 21.8426 Tj
0 -417.7079 Td
(0791 ) 21.8426 Tj
0 -427.2012 Td
(0792 ) 21.8426 Tj
0 -436.6946 Td
(0793 ) 21.8426 Tj
0 -446.1879 Td
(0794 ) 21.8426 Tj
0 -455.6813 Td
(0795 ) 21.8426 Tj
0 -465.1747 Td
(0796 ) 21.8426 Tj
0 -474.668 Td
(0797 ) 21.8426 Tj
0 -484.1614 Td
(0798 ) 21.8426 Tj
0 -493.6547 Td
(0799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 07) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 15 15
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/elf.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0800 // Format of an ELF executable file) 174.7406 Tj
0 -37.9735 Td
(0801 ) 21.8426 Tj
0 -47.4668 Td
(0802 #define ELF_MAGIC 0x464C457FU  // "\\x7FELF" in little end\
ian) 283.9534 Tj
0 -56.9602 Td
(0803 ) 21.8426 Tj
0 -66.4535 Td
(0804 // File header) 83.0018 Tj
0 -75.9469 Td
(0805 struct elfhdr {) 87.3703 Tj
0 -85.4403 Td
(0806   uint magic;  // must equal ELF_MAGIC) 187.8461 Tj
0 -94.9336 Td
(0807   uchar elf[12];) 91.7388 Tj
0 -104.427 Td
(0808   ushort type;) 83.0018 Tj
0 -113.9203 Td
(0809   ushort machine;) 96.1073 Tj
0 -123.4137 Td
(0810   uint version;) 87.3703 Tj
0 -132.9071 Td
(0811   uint entry;) 78.6333 Tj
0 -142.4004 Td
(0812   uint phoff;) 78.6333 Tj
0 -151.8938 Td
(0813   uint shoff;) 78.6333 Tj
0 -161.3871 Td
(0814   uint flags;) 78.6333 Tj
0 -170.8805 Td
(0815   ushort ehsize;) 91.7388 Tj
0 -180.3739 Td
(0816   ushort phentsize;) 104.8443 Tj
0 -189.8672 Td
(0817   ushort phnum;) 87.3703 Tj
0 -199.3606 Td
(0818   ushort shentsize;) 104.8443 Tj
0 -208.8539 Td
(0819   ushort shnum;) 87.3703 Tj
0 -218.3473 Td
(0820   ushort shstrndx;) 100.4758 Tj
0 -227.8407 Td
(0821 };) 30.5796 Tj
0 -237.334 Td
(0822 ) 21.8426 Tj
0 -246.8274 Td
(0823 // Program section header) 131.0554 Tj
0 -256.3207 Td
(0824 struct proghdr {) 91.7388 Tj
0 -265.8141 Td
(0825   uint type;) 74.2647 Tj
0 -275.3075 Td
(0826   uint offset;) 83.0018 Tj
0 -284.8008 Td
(0827   uint va;) 65.5277 Tj
0 -294.2942 Td
(0828   uint pa;) 65.5277 Tj
0 -303.7875 Td
(0829   uint filesz;) 83.0018 Tj
0 -313.2809 Td
(0830   uint memsz;) 78.6333 Tj
0 -322.7743 Td
(0831   uint flags;) 78.6333 Tj
0 -332.2676 Td
(0832   uint align;) 78.6333 Tj
0 -341.761 Td
(0833 };) 30.5796 Tj
0 -351.2543 Td
(0834 ) 21.8426 Tj
0 -360.7477 Td
(0835 // Values for Proghdr type) 135.4239 Tj
0 -370.2411 Td
(0836 #define ELF_PROG_LOAD           1) 166.0035 Tj
0 -379.7344 Td
(0837 ) 21.8426 Tj
0 -389.2278 Td
(0838 // Flag bits for Proghdr flags) 152.898 Tj
0 -398.7211 Td
(0839 #define ELF_PROG_FLAG_EXEC      1) 166.0035 Tj
0 -408.2145 Td
(0840 #define ELF_PROG_FLAG_WRITE     2) 166.0035 Tj
0 -417.7079 Td
(0841 #define ELF_PROG_FLAG_READ      4) 166.0035 Tj
0 -427.2012 Td
(0842 ) 21.8426 Tj
0 -436.6946 Td
(0843 ) 21.8426 Tj
0 -446.1879 Td
(0844 ) 21.8426 Tj
0 -455.6813 Td
(0845 ) 21.8426 Tj
0 -465.1747 Td
(0846 ) 21.8426 Tj
0 -474.668 Td
(0847 ) 21.8426 Tj
0 -484.1614 Td
(0848 ) 21.8426 Tj
0 -493.6547 Td
(0849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 08) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/elf.h  Page 2) 157.2665 Tj
0 -28.4801 Td
(0850 // Blank page.) 83.0018 Tj
0 -37.9735 Td
(0851 ) 21.8426 Tj
0 -47.4668 Td
(0852 ) 21.8426 Tj
0 -56.9602 Td
(0853 ) 21.8426 Tj
0 -66.4535 Td
(0854 ) 21.8426 Tj
0 -75.9469 Td
(0855 ) 21.8426 Tj
0 -85.4403 Td
(0856 ) 21.8426 Tj
0 -94.9336 Td
(0857 ) 21.8426 Tj
0 -104.427 Td
(0858 ) 21.8426 Tj
0 -113.9203 Td
(0859 ) 21.8426 Tj
0 -123.4137 Td
(0860 ) 21.8426 Tj
0 -132.9071 Td
(0861 ) 21.8426 Tj
0 -142.4004 Td
(0862 ) 21.8426 Tj
0 -151.8938 Td
(0863 ) 21.8426 Tj
0 -161.3871 Td
(0864 ) 21.8426 Tj
0 -170.8805 Td
(0865 ) 21.8426 Tj
0 -180.3739 Td
(0866 ) 21.8426 Tj
0 -189.8672 Td
(0867 ) 21.8426 Tj
0 -199.3606 Td
(0868 ) 21.8426 Tj
0 -208.8539 Td
(0869 ) 21.8426 Tj
0 -218.3473 Td
(0870 ) 21.8426 Tj
0 -227.8407 Td
(0871 ) 21.8426 Tj
0 -237.334 Td
(0872 ) 21.8426 Tj
0 -246.8274 Td
(0873 ) 21.8426 Tj
0 -256.3207 Td
(0874 ) 21.8426 Tj
0 -265.8141 Td
(0875 ) 21.8426 Tj
0 -275.3075 Td
(0876 ) 21.8426 Tj
0 -284.8008 Td
(0877 ) 21.8426 Tj
0 -294.2942 Td
(0878 ) 21.8426 Tj
0 -303.7875 Td
(0879 ) 21.8426 Tj
0 -313.2809 Td
(0880 ) 21.8426 Tj
0 -322.7743 Td
(0881 ) 21.8426 Tj
0 -332.2676 Td
(0882 ) 21.8426 Tj
0 -341.761 Td
(0883 ) 21.8426 Tj
0 -351.2543 Td
(0884 ) 21.8426 Tj
0 -360.7477 Td
(0885 ) 21.8426 Tj
0 -370.2411 Td
(0886 ) 21.8426 Tj
0 -379.7344 Td
(0887 ) 21.8426 Tj
0 -389.2278 Td
(0888 ) 21.8426 Tj
0 -398.7211 Td
(0889 ) 21.8426 Tj
0 -408.2145 Td
(0890 ) 21.8426 Tj
0 -417.7079 Td
(0891 ) 21.8426 Tj
0 -427.2012 Td
(0892 ) 21.8426 Tj
0 -436.6946 Td
(0893 ) 21.8426 Tj
0 -446.1879 Td
(0894 ) 21.8426 Tj
0 -455.6813 Td
(0895 ) 21.8426 Tj
0 -465.1747 Td
(0896 ) 21.8426 Tj
0 -474.668 Td
(0897 ) 21.8426 Tj
0 -484.1614 Td
(0898 ) 21.8426 Tj
0 -493.6547 Td
(0899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 08) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 16 16
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/bootasm.S  Page 1) 174.7406 Tj
0 -28.4801 Td
(0900 #include "asm.h") 91.7388 Tj
0 -37.9735 Td
(0901 ) 21.8426 Tj
0 -47.4668 Td
(0902 # Start the first CPU: switch to 32-bit protected mode, ju\
mp into C.) 318.9016 Tj
0 -56.9602 Td
(0903 # The BIOS loads this code from the first sector of the ha\
rd disk into) 327.6386 Tj
0 -66.4535 Td
(0904 # memory at physical address 0x7c00 and starts executing i\
n real mode) 323.2701 Tj
0 -75.9469 Td
(0905 # with %cs=0 %ip=7c00.) 117.9499 Tj
0 -85.4403 Td
(0906 ) 21.8426 Tj
0 -94.9336 Td
(0907 .set PROT_MODE_CSEG, 0x8         # kernel code segment sel\
ector) 297.059 Tj
0 -104.427 Td
(0908 .set PROT_MODE_DSEG, 0x10        # kernel data segment sel\
ector) 297.059 Tj
0 -113.9203 Td
(0909 .set CR0_PE_ON,      0x1         # protected mode enable f\
lag) 288.322 Tj
0 -123.4137 Td
(0910 ) 21.8426 Tj
0 -132.9071 Td
(0911 .globl start) 74.2647 Tj
0 -142.4004 Td
(0912 start:) 48.0537 Tj
0 -151.8938 Td
(0913   .code16                     # Assemble for 16-bit mode) 266.4794 Tj
0 -161.3871 Td
(0914   cli                         # Disable interrupts) 240.2683 Tj
0 -170.8805 Td
(0915   cld                         # String operations incremen\
t) 279.5849 Tj
0 -180.3739 Td
(0916 ) 21.8426 Tj
0 -189.8672 Td
(0917   # Set up the important data segment registers \(DS, ES, \
SS\).) 288.322 Tj
0 -199.3606 Td
(0918   xorw    %ax,%ax             # Segment number zero) 244.6368 Tj
0 -208.8539 Td
(0919   movw    %ax,%ds             # -> Data Segment) 227.1628 Tj
0 -218.3473 Td
(0920   movw    %ax,%es             # -> Extra Segment) 231.5313 Tj
0 -227.8407 Td
(0921   movw    %ax,%ss             # -> Stack Segment) 231.5313 Tj
0 -237.334 Td
(0922 ) 21.8426 Tj
0 -246.8274 Td
(0923   # Enable A20:) 87.3703 Tj
0 -256.3207 Td
(0924   #   For backwards compatibility with the earliest PCs, p\
hysical) 305.796 Tj
0 -265.8141 Td
(0925   #   address line 20 is tied low, so that addresses highe\
r than) 301.4275 Tj
0 -275.3075 Td
(0926   #   1MB wrap around to zero by default.  This code undoe\
s this.) 305.796 Tj
0 -284.8008 Td
(0927 seta20.1:) 61.1592 Tj
0 -294.2942 Td
(0928   inb     $0x64,%al               # Wait for not busy) 253.3738 Tj
0 -303.7875 Td
(0929   testb   $0x2,%al) 100.4758 Tj
0 -313.2809 Td
(0930   jnz     seta20.1) 100.4758 Tj
0 -322.7743 Td
(0931 ) 21.8426 Tj
0 -332.2676 Td
(0932   movb    $0xd1,%al               # 0xd1 -> port 0x64) 253.3738 Tj
0 -341.761 Td
(0933   outb    %al,$0x64) 104.8443 Tj
0 -351.2543 Td
(0934 ) 21.8426 Tj
0 -360.7477 Td
(0935 seta20.2:) 61.1592 Tj
0 -370.2411 Td
(0936   inb     $0x64,%al               # Wait for not busy) 253.3738 Tj
0 -379.7344 Td
(0937   testb   $0x2,%al) 100.4758 Tj
0 -389.2278 Td
(0938   jnz     seta20.2) 100.4758 Tj
0 -398.7211 Td
(0939 ) 21.8426 Tj
0 -408.2145 Td
(0940   movb    $0xdf,%al               # 0xdf -> port 0x60) 253.3738 Tj
0 -417.7079 Td
(0941   outb    %al,$0x60) 104.8443 Tj
0 -427.2012 Td
(0942 ) 21.8426 Tj
0 -436.6946 Td
(0943 ) 21.8426 Tj
0 -446.1879 Td
(0944 ) 21.8426 Tj
0 -455.6813 Td
(0945 ) 21.8426 Tj
0 -465.1747 Td
(0946 ) 21.8426 Tj
0 -474.668 Td
(0947 ) 21.8426 Tj
0 -484.1614 Td
(0948 ) 21.8426 Tj
0 -493.6547 Td
(0949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 09) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/bootasm.S  Page 2) 174.7406 Tj
0 -28.4801 Td
(0950   # Switch from real to protected mode, using a bootstrap \
GDT) 288.322 Tj
0 -37.9735 Td
(0951   # and segment translation that makes virtual addresses) 266.4794 Tj
0 -47.4668 Td
(0952   # identical to physical addresses, so that the) 231.5313 Tj
0 -56.9602 Td
(0953   # effective memory map does not change during the switch\
.) 279.5849 Tj
0 -66.4535 Td
(0954   lgdt    gdtdesc) 96.1073 Tj
0 -75.9469 Td
(0955   movl    %cr0, %eax) 109.2129 Tj
0 -85.4403 Td
(0956   orl     $CR0_PE_ON, %eax) 135.4239 Tj
0 -94.9336 Td
(0957   movl    %eax, %cr0) 109.2129 Tj
0 -104.427 Td
(0958 ) 21.8426 Tj
0 -113.9203 Td
(0959   # Jump to next instruction, but in 32-bit code segment.) 270.8479 Tj
0 -123.4137 Td
(0960   # Switches processor into 32-bit mode.) 196.5831 Tj
0 -132.9071 Td
(0961   ljmp    $PROT_MODE_CSEG, $protcseg) 179.1091 Tj
0 -142.4004 Td
(0962 ) 21.8426 Tj
0 -151.8938 Td
(0963   .code32                     # Assemble for 32-bit mode) 266.4794 Tj
0 -161.3871 Td
(0964 protcseg:) 61.1592 Tj
0 -170.8805 Td
(0965   # Set up the protected-mode data segment registers) 249.0053 Tj
0 -180.3739 Td
(0966   movw    $PROT_MODE_DSEG, %ax    # Our data segment selec\
tor) 288.322 Tj
0 -189.8672 Td
(0967   movw    %ax, %ds                # -> DS: Data Segment) 262.1109 Tj
0 -199.3606 Td
(0968   movw    %ax, %es                # -> ES: Extra Segment) 266.4794 Tj
0 -208.8539 Td
(0969   movw    %ax, %fs                # -> FS) 200.9517 Tj
0 -218.3473 Td
(0970   movw    %ax, %gs                # -> GS) 200.9517 Tj
0 -227.8407 Td
(0971   movw    %ax, %ss                # -> SS: Stack Segment) 266.4794 Tj
0 -237.334 Td
(0972 ) 21.8426 Tj
0 -246.8274 Td
(0973   # Set up the stack pointer and call into C.) 218.4257 Tj
0 -256.3207 Td
(0974   movl    $start, %esp) 117.9499 Tj
0 -265.8141 Td
(0975   call    bootmain) 100.4758 Tj
0 -275.3075 Td
(0976 ) 21.8426 Tj
0 -284.8008 Td
(0977   # If bootmain returns \(it shouldn't\), loop.) 218.4257 Tj
0 -294.2942 Td
(0978 spin:) 43.6851 Tj
0 -303.7875 Td
(0979   jmp     spin) 83.0018 Tj
0 -313.2809 Td
(0980 ) 21.8426 Tj
0 -322.7743 Td
(0981 # Bootstrap GDT) 87.3703 Tj
0 -332.2676 Td
(0982 .p2align 2                                # force 4 byte a\
lignment) 310.1645 Tj
0 -341.761 Td
(0983 gdt:) 39.3166 Tj
0 -351.2543 Td
(0984   SEG_NULLASM                             # null seg) 249.0053 Tj
0 -360.7477 Td
(0985   SEG_ASM\(STA_X|STA_R, 0x0, 0xffffffff\)   # code seg) 249.0053 Tj
0 -370.2411 Td
(0986   SEG_ASM\(STA_W, 0x0, 0xffffffff\)         # data seg) 249.0053 Tj
0 -379.7344 Td
(0987 ) 21.8426 Tj
0 -389.2278 Td
(0988 gdtdesc:) 56.7907 Tj
0 -398.7211 Td
(0989   .word   0x17                            # sizeof\(gdt\) \
- 1) 279.5849 Tj
0 -408.2145 Td
(0990   .long   gdt                             # address gdt) 262.1109 Tj
0 -417.7079 Td
(0991 ) 21.8426 Tj
0 -427.2012 Td
(0992 ) 21.8426 Tj
0 -436.6946 Td
(0993 ) 21.8426 Tj
0 -446.1879 Td
(0994 ) 21.8426 Tj
0 -455.6813 Td
(0995 ) 21.8426 Tj
0 -465.1747 Td
(0996 ) 21.8426 Tj
0 -474.668 Td
(0997 ) 21.8426 Tj
0 -484.1614 Td
(0998 ) 21.8426 Tj
0 -493.6547 Td
(0999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 09) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 17 17
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/bootother.S  Page 1) 183.4776 Tj
0 -28.4801 Td
(1000 #include "asm.h") 91.7388 Tj
0 -37.9735 Td
(1001 ) 21.8426 Tj
0 -47.4668 Td
(1002 # Each non-boot CPU \("AP"\) is started up in response to \
a STARTUP) 305.796 Tj
0 -56.9602 Td
(1003 # IPI from the boot CPU.  Section B.4.2 of the Multi-Proce\
ssor) 292.6905 Tj
0 -66.4535 Td
(1004 # Specification says that the AP will start in real mode w\
ith CS:IP) 314.533 Tj
0 -75.9469 Td
(1005 # set to XY00:0000, where XY is an 8-bit value sent with t\
he) 283.9534 Tj
0 -85.4403 Td
(1006 # STARTUP. Thus this code must start at a 4096-byte bounda\
ry.) 288.322 Tj
0 -94.9336 Td
(1007 #) 26.2111 Tj
0 -104.427 Td
(1008 # Because this code sets DS to zero, it must sit) 231.5313 Tj
0 -113.9203 Td
(1009 # at an address in the low 2^16 bytes.) 187.8461 Tj
0 -123.4137 Td
(1010 #) 26.2111 Tj
0 -132.9071 Td
(1011 # Bootothers \(in main.c\) sends the STARTUPs, one at a ti\
me.) 279.5849 Tj
0 -142.4004 Td
(1012 # It puts this code \(start\) at 0x7000.) 187.8461 Tj
0 -151.8938 Td
(1013 # It puts the correct %esp in start-4,) 187.8461 Tj
0 -161.3871 Td
(1014 # and the place to jump to in start-8.) 187.8461 Tj
0 -170.8805 Td
(1015 #) 26.2111 Tj
0 -180.3739 Td
(1016 # This code is identical to bootasm.S except:) 218.4257 Tj
0 -189.8672 Td
(1017 #   - it does not need to enable A20) 179.1091 Tj
0 -199.3606 Td
(1018 #   - it uses the address at start-4 for the %esp) 235.8998 Tj
0 -208.8539 Td
(1019 #   - it jumps to the address at start-8 instead of callin\
g bootmain) 318.9016 Tj
0 -218.3473 Td
(1020 ) 21.8426 Tj
0 -227.8407 Td
(1021 .set PROT_MODE_CSEG, 0x8         # kernel code segment sel\
ector) 297.059 Tj
0 -237.334 Td
(1022 .set PROT_MODE_DSEG, 0x10        # kernel data segment sel\
ector) 297.059 Tj
0 -246.8274 Td
(1023 .set CR0_PE_ON,      0x1         # protected mode enable f\
lag) 288.322 Tj
0 -256.3207 Td
(1024 ) 21.8426 Tj
0 -265.8141 Td
(1025 .globl start) 74.2647 Tj
0 -275.3075 Td
(1026 start:) 48.0537 Tj
0 -284.8008 Td
(1027   .code16                     # Assemble for 16-bit mode) 266.4794 Tj
0 -294.2942 Td
(1028   cli                         # Disable interrupts) 240.2683 Tj
0 -303.7875 Td
(1029   cld                         # String operations incremen\
t) 279.5849 Tj
0 -313.2809 Td
(1030 ) 21.8426 Tj
0 -322.7743 Td
(1031   # Set up the important data segment registers \(DS, ES, \
SS\).) 288.322 Tj
0 -332.2676 Td
(1032   xorw    %ax,%ax             # Segment number zero) 244.6368 Tj
0 -341.761 Td
(1033   movw    %ax,%ds             # -> Data Segment) 227.1628 Tj
0 -351.2543 Td
(1034   movw    %ax,%es             # -> Extra Segment) 231.5313 Tj
0 -360.7477 Td
(1035   movw    %ax,%ss             # -> Stack Segment) 231.5313 Tj
0 -370.2411 Td
(1036 ) 21.8426 Tj
0 -379.7344 Td
(1037 ) 21.8426 Tj
0 -389.2278 Td
(1038 ) 21.8426 Tj
0 -398.7211 Td
(1039 ) 21.8426 Tj
0 -408.2145 Td
(1040 ) 21.8426 Tj
0 -417.7079 Td
(1041 ) 21.8426 Tj
0 -427.2012 Td
(1042 ) 21.8426 Tj
0 -436.6946 Td
(1043 ) 21.8426 Tj
0 -446.1879 Td
(1044 ) 21.8426 Tj
0 -455.6813 Td
(1045 ) 21.8426 Tj
0 -465.1747 Td
(1046 ) 21.8426 Tj
0 -474.668 Td
(1047 ) 21.8426 Tj
0 -484.1614 Td
(1048 ) 21.8426 Tj
0 -493.6547 Td
(1049 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 10) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/bootother.S  Page 2) 183.4776 Tj
0 -28.4801 Td
(1050   # Switch from real to protected mode, using a bootstrap \
GDT) 288.322 Tj
0 -37.9735 Td
(1051   # and segment translation that makes virtual addresses) 266.4794 Tj
0 -47.4668 Td
(1052   # identical to their physical addresses, so that the) 257.7424 Tj
0 -56.9602 Td
(1053   # effective memory map does not change during the switch\
.) 279.5849 Tj
0 -66.4535 Td
(1054   lgdt    gdtdesc) 96.1073 Tj
0 -75.9469 Td
(1055   movl    %cr0, %eax) 109.2129 Tj
0 -85.4403 Td
(1056   orl     $CR0_PE_ON, %eax) 135.4239 Tj
0 -94.9336 Td
(1057   movl    %eax, %cr0) 109.2129 Tj
0 -104.427 Td
(1058 ) 21.8426 Tj
0 -113.9203 Td
(1059   # Jump to next instruction, but in 32-bit code segment.) 270.8479 Tj
0 -123.4137 Td
(1060   # Switches processor into 32-bit mode.) 196.5831 Tj
0 -132.9071 Td
(1061   ljmp    $PROT_MODE_CSEG, $protcseg) 179.1091 Tj
0 -142.4004 Td
(1062 ) 21.8426 Tj
0 -151.8938 Td
(1063   .code32                     # Assemble for 32-bit mode) 266.4794 Tj
0 -161.3871 Td
(1064 protcseg:) 61.1592 Tj
0 -170.8805 Td
(1065   # Set up the protected-mode data segment registers) 249.0053 Tj
0 -180.3739 Td
(1066   movw    $PROT_MODE_DSEG, %ax    # Our data segment selec\
tor) 288.322 Tj
0 -189.8672 Td
(1067   movw    %ax, %ds                # -> DS: Data Segment) 262.1109 Tj
0 -199.3606 Td
(1068   movw    %ax, %es                # -> ES: Extra Segment) 266.4794 Tj
0 -208.8539 Td
(1069   movw    %ax, %fs                # -> FS) 200.9517 Tj
0 -218.3473 Td
(1070   movw    %ax, %gs                # -> GS) 200.9517 Tj
0 -227.8407 Td
(1071   movw    %ax, %ss                # -> SS: Stack Segment) 266.4794 Tj
0 -237.334 Td
(1072 ) 21.8426 Tj
0 -246.8274 Td
(1073   movl    start-4, %esp) 122.3184 Tj
0 -256.3207 Td
(1074   movl    start-8, %eax) 122.3184 Tj
0 -265.8141 Td
(1075   jmp     *%eax) 87.3703 Tj
0 -275.3075 Td
(1076 ) 21.8426 Tj
0 -284.8008 Td
(1077 # Bootstrap GDT) 87.3703 Tj
0 -294.2942 Td
(1078 .p2align 2                                # force 4 byte a\
lignment) 310.1645 Tj
0 -303.7875 Td
(1079 gdt:) 39.3166 Tj
0 -313.2809 Td
(1080   SEG_NULLASM                             # null seg) 249.0053 Tj
0 -322.7743 Td
(1081   SEG_ASM\(STA_X|STA_R, 0x0, 0xffffffff\)   # code seg) 249.0053 Tj
0 -332.2676 Td
(1082   SEG_ASM\(STA_W, 0x0, 0xffffffff\)         # data seg) 249.0053 Tj
0 -341.761 Td
(1083 ) 21.8426 Tj
0 -351.2543 Td
(1084 gdtdesc:) 56.7907 Tj
0 -360.7477 Td
(1085   .word   0x17                            # sizeof\(gdt\) \
- 1) 279.5849 Tj
0 -370.2411 Td
(1086   .long   gdt                             # address gdt) 262.1109 Tj
0 -379.7344 Td
(1087 ) 21.8426 Tj
0 -389.2278 Td
(1088 ) 21.8426 Tj
0 -398.7211 Td
(1089 ) 21.8426 Tj
0 -408.2145 Td
(1090 ) 21.8426 Tj
0 -417.7079 Td
(1091 ) 21.8426 Tj
0 -427.2012 Td
(1092 ) 21.8426 Tj
0 -436.6946 Td
(1093 ) 21.8426 Tj
0 -446.1879 Td
(1094 ) 21.8426 Tj
0 -455.6813 Td
(1095 ) 21.8426 Tj
0 -465.1747 Td
(1096 ) 21.8426 Tj
0 -474.668 Td
(1097 ) 21.8426 Tj
0 -484.1614 Td
(1098 ) 21.8426 Tj
0 -493.6547 Td
(1099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 10) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 18 18
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/bootmain.c  Page 1) 179.1091 Tj
0 -28.4801 Td
(1100 // Boot loader.) 87.3703 Tj
0 -37.9735 Td
(1101 //) 30.5796 Tj
0 -47.4668 Td
(1102 // Part of the boot sector, along with bootasm.S, which ca\
lls bootmain\(\).) 340.7441 Tj
0 -56.9602 Td
(1103 // bootasm.S has put the processor into protected 32-bit m\
ode.) 292.6905 Tj
0 -66.4535 Td
(1104 // bootmain\(\) loads an ELF kernel image from the disk st\
arting at) 305.796 Tj
0 -75.9469 Td
(1105 // sector 1 and then jumps to the kernel entry routine.) 262.1109 Tj
0 -85.4403 Td
(1106 ) 21.8426 Tj
0 -94.9336 Td
(1107 #include "types.h") 100.4758 Tj
0 -104.427 Td
(1108 #include "elf.h") 91.7388 Tj
0 -113.9203 Td
(1109 #include "x86.h") 91.7388 Tj
0 -123.4137 Td
(1110 ) 21.8426 Tj
0 -132.9071 Td
(1111 #define SECTSIZE  512) 113.5814 Tj
0 -142.4004 Td
(1112 ) 21.8426 Tj
0 -151.8938 Td
(1113 void readseg\(uint, uint, uint\);) 157.2665 Tj
0 -161.3871 Td
(1114 ) 21.8426 Tj
0 -170.8805 Td
(1115 void) 39.3166 Tj
0 -180.3739 Td
(1116 bootmain\(void\)) 83.0018 Tj
0 -189.8672 Td
(1117 {) 26.2111 Tj
0 -199.3606 Td
(1118   struct elfhdr *elf;) 113.5814 Tj
0 -208.8539 Td
(1119   struct proghdr *ph, *eph;) 139.7925 Tj
0 -218.3473 Td
(1120   void \(*entry\)\(void\);) 117.9499 Tj
0 -227.8407 Td
(1121 ) 21.8426 Tj
0 -237.334 Td
(1122   elf = \(struct elfhdr*\)0x10000;  // scratch space) 240.2683 Tj
0 -246.8274 Td
(1123 ) 21.8426 Tj
0 -256.3207 Td
(1124   // Read 1st page off disk) 139.7925 Tj
0 -265.8141 Td
(1125   readseg\(\(uint\)elf, SECTSIZE*8, 0\);) 179.1091 Tj
0 -275.3075 Td
(1126 ) 21.8426 Tj
0 -284.8008 Td
(1127   // Is this an ELF executable?) 157.2665 Tj
0 -294.2942 Td
(1128   if\(elf->magic != ELF_MAGIC\)) 148.5295 Tj
0 -303.7875 Td
(1129     goto bad;) 78.6333 Tj
0 -313.2809 Td
(1130 ) 21.8426 Tj
0 -322.7743 Td
(1131   // Load each program segment \(ignores ph flags\).) 240.2683 Tj
0 -332.2676 Td
(1132   ph = \(struct proghdr*\)\(\(uchar*\)elf + elf->phoff\);) 244.6368 Tj
0 -341.761 Td
(1133   eph = ph + elf->phnum;) 126.6869 Tj
0 -351.2543 Td
(1134   for\(; ph < eph; ph++\)) 122.3184 Tj
0 -360.7477 Td
(1135     readseg\(ph->va & 0xFFFFFF, ph->memsz, ph->offset\);) 257.7424 Tj
0 -370.2411 Td
(1136 ) 21.8426 Tj
0 -379.7344 Td
(1137   // Call the entry point from the ELF header.) 222.7942 Tj
0 -389.2278 Td
(1138   // Does not return!) 113.5814 Tj
0 -398.7211 Td
(1139   entry = \(void\(*\)\(void\)\)\(elf->entry & 0xFFFFFF\);) 235.8998 Tj
0 -408.2145 Td
(1140   entry\(\);) 65.5277 Tj
0 -417.7079 Td
(1141 ) 21.8426 Tj
0 -427.2012 Td
(1142 bad:) 39.3166 Tj
0 -436.6946 Td
(1143   outw\(0x8A00, 0x8A00\);) 122.3184 Tj
0 -446.1879 Td
(1144   outw\(0x8A00, 0x8E00\);) 122.3184 Tj
0 -455.6813 Td
(1145   for\(;;\)) 61.1592 Tj
0 -465.1747 Td
(1146     ;) 43.6851 Tj
0 -474.668 Td
(1147 }) 26.2111 Tj
0 -484.1614 Td
(1148 ) 21.8426 Tj
0 -493.6547 Td
(1149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 11) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/bootmain.c  Page 2) 179.1091 Tj
0 -28.4801 Td
(1150 void) 39.3166 Tj
0 -37.9735 Td
(1151 waitdisk\(void\)) 83.0018 Tj
0 -47.4668 Td
(1152 {) 26.2111 Tj
0 -56.9602 Td
(1153   // Wait for disk ready.) 131.0554 Tj
0 -66.4535 Td
(1154   while\(\(inb\(0x1F7\) & 0xC0\) != 0x40\)) 179.1091 Tj
0 -75.9469 Td
(1155     ;) 43.6851 Tj
0 -85.4403 Td
(1156 }) 26.2111 Tj
0 -94.9336 Td
(1157 ) 21.8426 Tj
0 -104.427 Td
(1158 // Read a single sector at offset into dst.) 209.6887 Tj
0 -113.9203 Td
(1159 void) 39.3166 Tj
0 -123.4137 Td
(1160 readsect\(void *dst, uint offset\)) 161.635 Tj
0 -132.9071 Td
(1161 {) 26.2111 Tj
0 -142.4004 Td
(1162   // Issue command.) 104.8443 Tj
0 -151.8938 Td
(1163   waitdisk\(\);) 78.6333 Tj
0 -161.3871 Td
(1164   outb\(0x1F2, 1\);   // count = 1) 161.635 Tj
0 -170.8805 Td
(1165   outb\(0x1F3, offset\);) 117.9499 Tj
0 -180.3739 Td
(1166   outb\(0x1F4, offset >> 8\);) 139.7925 Tj
0 -189.8672 Td
(1167   outb\(0x1F5, offset >> 16\);) 144.161 Tj
0 -199.3606 Td
(1168   outb\(0x1F6, \(offset >> 24\) | 0xE0\);) 183.4776 Tj
0 -208.8539 Td
(1169   outb\(0x1F7, 0x20\);  // cmd 0x20 - read sectors) 231.5313 Tj
0 -218.3473 Td
(1170 ) 21.8426 Tj
0 -227.8407 Td
(1171   // Read data.) 87.3703 Tj
0 -237.334 Td
(1172   waitdisk\(\);) 78.6333 Tj
0 -246.8274 Td
(1173   insl\(0x1F0, dst, SECTSIZE/4\);) 157.2665 Tj
0 -256.3207 Td
(1174 }) 26.2111 Tj
0 -265.8141 Td
(1175 ) 21.8426 Tj
0 -275.3075 Td
(1176 // Read 'count' bytes at 'offset' from kernel into virtual\
 address 'va'.) 336.3756 Tj
0 -284.8008 Td
(1177 // Might copy more than asked.) 152.898 Tj
0 -294.2942 Td
(1178 void) 39.3166 Tj
0 -303.7875 Td
(1179 readseg\(uint va, uint count, uint offset\)) 200.9517 Tj
0 -313.2809 Td
(1180 {) 26.2111 Tj
0 -322.7743 Td
(1181   uint eva;) 69.8962 Tj
0 -332.2676 Td
(1182 ) 21.8426 Tj
0 -341.761 Td
(1183   eva = va + count;) 104.8443 Tj
0 -351.2543 Td
(1184 ) 21.8426 Tj
0 -360.7477 Td
(1185   // Round down to sector boundary.) 174.7406 Tj
0 -370.2411 Td
(1186   va &= ~\(SECTSIZE - 1\);) 126.6869 Tj
0 -379.7344 Td
(1187 ) 21.8426 Tj
0 -389.2278 Td
(1188   // Translate from bytes to sectors; kernel starts at sec\
tor 1.) 301.4275 Tj
0 -398.7211 Td
(1189   offset = \(offset / SECTSIZE\) + 1;) 174.7406 Tj
0 -408.2145 Td
(1190 ) 21.8426 Tj
0 -417.7079 Td
(1191   // If this is too slow, we could read lots of sectors at\
 a time.) 310.1645 Tj
0 -427.2012 Td
(1192   // We'd write more to memory than asked, but it doesn't \
matter --) 314.533 Tj
0 -436.6946 Td
(1193   // we load in increasing order.) 166.0035 Tj
0 -446.1879 Td
(1194   for\(; va < eva; va += SECTSIZE, offset++\)) 209.6887 Tj
0 -455.6813 Td
(1195     readsect\(\(uchar*\)va, offset\);) 166.0035 Tj
0 -465.1747 Td
(1196 }) 26.2111 Tj
0 -474.668 Td
(1197 ) 21.8426 Tj
0 -484.1614 Td
(1198 ) 21.8426 Tj
0 -493.6547 Td
(1199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 11) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 19 19
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/main.c  Page 1) 161.635 Tj
0 -28.4801 Td
(1200 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(1201 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(1202 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(1203 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(1204 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(1205 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(1206 ) 21.8426 Tj
0 -94.9336 Td
(1207 static void bootothers\(void\);) 148.5295 Tj
0 -104.427 Td
(1208 static void mpmain\(void\) __attribute__\(\(noreturn\)\);) 244.6368 Tj
0 -113.9203 Td
(1209 ) 21.8426 Tj
0 -123.4137 Td
(1210 // Bootstrap processor starts running C code here.) 240.2683 Tj
0 -132.9071 Td
(1211 int) 34.9481 Tj
0 -142.4004 Td
(1212 main\(void\)) 65.5277 Tj
0 -151.8938 Td
(1213 {) 26.2111 Tj
0 -161.3871 Td
(1214   extern char edata[], end[];) 148.5295 Tj
0 -170.8805 Td
(1215 ) 21.8426 Tj
0 -180.3739 Td
(1216   // clear BSS) 83.0018 Tj
0 -189.8672 Td
(1217   memset\(edata, 0, end - edata\);) 161.635 Tj
0 -199.3606 Td
(1218 ) 21.8426 Tj
0 -208.8539 Td
(1219   mp_init\(\); // collect info about this machine) 227.1628 Tj
0 -218.3473 Td
(1220   lapic_init\(mp_bcpu\(\)\);) 126.6869 Tj
0 -227.8407 Td
(1221   cprintf\("\\ncpu%d: starting xv6\\n\\n", cpu\(\)\);) 222.7942 Tj
0 -237.334 Td
(1222 ) 21.8426 Tj
0 -246.8274 Td
(1223   pinit\(\);         // process table) 174.7406 Tj
0 -256.3207 Td
(1224   binit\(\);         // buffer cache) 170.3721 Tj
0 -265.8141 Td
(1225   pic_init\(\);      // interrupt controller) 205.3202 Tj
0 -275.3075 Td
(1226   ioapic_init\(\);   // another interrupt controller) 240.2683 Tj
0 -284.8008 Td
(1227   kinit\(\);         // physical memory allocator) 227.1628 Tj
0 -294.2942 Td
(1228   tvinit\(\);        // trap vectors) 170.3721 Tj
0 -303.7875 Td
(1229   fileinit\(\);      // file table) 161.635 Tj
0 -313.2809 Td
(1230   iinit\(\);         // inode cache) 166.0035 Tj
0 -322.7743 Td
(1231   console_init\(\);  // I/O devices & their interrupts) 249.0053 Tj
0 -332.2676 Td
(1232   ide_init\(\);      // disk) 135.4239 Tj
0 -341.761 Td
(1233   if\(!ismp\)) 69.8962 Tj
0 -351.2543 Td
(1234     timer_init\(\);  // uniprocessor timer) 196.5831 Tj
0 -360.7477 Td
(1235   userinit\(\);      // first user process) 196.5831 Tj
0 -370.2411 Td
(1236   bootothers\(\);    // start other processors) 214.0572 Tj
0 -379.7344 Td
(1237 ) 21.8426 Tj
0 -389.2278 Td
(1238   // Finish setting up this processor in mpmain.) 231.5313 Tj
0 -398.7211 Td
(1239   mpmain\(\);) 69.8962 Tj
0 -408.2145 Td
(1240 }) 26.2111 Tj
0 -417.7079 Td
(1241 ) 21.8426 Tj
0 -427.2012 Td
(1242 ) 21.8426 Tj
0 -436.6946 Td
(1243 ) 21.8426 Tj
0 -446.1879 Td
(1244 ) 21.8426 Tj
0 -455.6813 Td
(1245 ) 21.8426 Tj
0 -465.1747 Td
(1246 ) 21.8426 Tj
0 -474.668 Td
(1247 ) 21.8426 Tj
0 -484.1614 Td
(1248 ) 21.8426 Tj
0 -493.6547 Td
(1249 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 12) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/main.c  Page 2) 161.635 Tj
0 -28.4801 Td
(1250 // Bootstrap processor gets here after setting up the hard\
ware.) 297.059 Tj
0 -37.9735 Td
(1251 // Additional processors start here.) 179.1091 Tj
0 -47.4668 Td
(1252 static void) 69.8962 Tj
0 -56.9602 Td
(1253 mpmain\(void\)) 74.2647 Tj
0 -66.4535 Td
(1254 {) 26.2111 Tj
0 -75.9469 Td
(1255   cprintf\("cpu%d: mpmain\\n", cpu\(\)\);) 179.1091 Tj
0 -85.4403 Td
(1256   idtinit\(\);) 74.2647 Tj
0 -94.9336 Td
(1257   if\(cpu\(\) != mp_bcpu\(\)\)) 126.6869 Tj
0 -104.427 Td
(1258     lapic_init\(cpu\(\)\);) 117.9499 Tj
0 -113.9203 Td
(1259   setupsegs\(0\);) 87.3703 Tj
0 -123.4137 Td
(1260   xchg\(&cpus[cpu\(\)].booted, 1\);) 157.2665 Tj
0 -132.9071 Td
(1261 ) 21.8426 Tj
0 -142.4004 Td
(1262   cprintf\("cpu%d: scheduling\\n", cpu\(\)\);) 196.5831 Tj
0 -151.8938 Td
(1263   scheduler\(\);) 83.0018 Tj
0 -161.3871 Td
(1264 }) 26.2111 Tj
0 -170.8805 Td
(1265 ) 21.8426 Tj
0 -180.3739 Td
(1266 static void) 69.8962 Tj
0 -189.8672 Td
(1267 bootothers\(void\)) 91.7388 Tj
0 -199.3606 Td
(1268 {) 26.2111 Tj
0 -208.8539 Td
(1269   extern uchar _binary_bootother_start[], _binary_bootothe\
r_size[];) 314.533 Tj
0 -218.3473 Td
(1270   uchar *code;) 83.0018 Tj
0 -227.8407 Td
(1271   struct cpu *c;) 91.7388 Tj
0 -237.334 Td
(1272   char *stack;) 83.0018 Tj
0 -246.8274 Td
(1273 ) 21.8426 Tj
0 -256.3207 Td
(1274   // Write bootstrap code to unused memory at 0x7000.) 253.3738 Tj
0 -265.8141 Td
(1275   code = \(uchar*\)0x7000;) 126.6869 Tj
0 -275.3075 Td
(1276   memmove\(code, _binary_bootother_start, \(uint\)_binary_\
bootother_size\);) 332.0071 Tj
0 -284.8008 Td
(1277 ) 21.8426 Tj
0 -294.2942 Td
(1278   for\(c = cpus; c < cpus+ncpu; c++\){) 179.1091 Tj
0 -303.7875 Td
(1279     if\(c == cpus+cpu\(\)\)  // We've started already.) 240.2683 Tj
0 -313.2809 Td
(1280       continue;) 87.3703 Tj
0 -322.7743 Td
(1281 ) 21.8426 Tj
0 -332.2676 Td
(1282     // Fill in %esp, %eip and start code on cpu.) 231.5313 Tj
0 -341.761 Td
(1283     stack = kalloc\(KSTACKSIZE\);) 157.2665 Tj
0 -351.2543 Td
(1284     *\(void**\)\(code-4\) = stack + KSTACKSIZE;) 209.6887 Tj
0 -360.7477 Td
(1285     *\(void**\)\(code-8\) = mpmain;) 157.2665 Tj
0 -370.2411 Td
(1286     lapic_startap\(c->apicid, \(uint\)code\);) 200.9517 Tj
0 -379.7344 Td
(1287 ) 21.8426 Tj
0 -389.2278 Td
(1288     // Wait for cpu to get through bootstrap.) 218.4257 Tj
0 -398.7211 Td
(1289     while\(c->booted == 0\)) 131.0554 Tj
0 -408.2145 Td
(1290       ;) 52.4222 Tj
0 -417.7079 Td
(1291   }) 34.9481 Tj
0 -427.2012 Td
(1292 }) 26.2111 Tj
0 -436.6946 Td
(1293 ) 21.8426 Tj
0 -446.1879 Td
(1294 ) 21.8426 Tj
0 -455.6813 Td
(1295 ) 21.8426 Tj
0 -465.1747 Td
(1296 ) 21.8426 Tj
0 -474.668 Td
(1297 ) 21.8426 Tj
0 -484.1614 Td
(1298 ) 21.8426 Tj
0 -493.6547 Td
(1299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 12) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 20 20
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/spinlock.h  Page 1) 179.1091 Tj
0 -28.4801 Td
(1300 // Mutual exclusion lock.) 131.0554 Tj
0 -37.9735 Td
(1301 struct spinlock {) 96.1073 Tj
0 -47.4668 Td
(1302   uint locked;   // Is the lock held?) 183.4776 Tj
0 -56.9602 Td
(1303 ) 21.8426 Tj
0 -66.4535 Td
(1304   // For debugging:) 104.8443 Tj
0 -75.9469 Td
(1305   char *name;    // Name of lock.) 166.0035 Tj
0 -85.4403 Td
(1306   int  cpu;      // The number of the cpu holding the lock\
.) 279.5849 Tj
0 -94.9336 Td
(1307   uint pcs[10];  // The call stack \(an array of program c\
ounters\)) 305.796 Tj
0 -104.427 Td
(1308                  // that locked the lock.) 200.9517 Tj
0 -113.9203 Td
(1309 };) 30.5796 Tj
0 -123.4137 Td
(1310 ) 21.8426 Tj
0 -132.9071 Td
(1311 ) 21.8426 Tj
0 -142.4004 Td
(1312 ) 21.8426 Tj
0 -151.8938 Td
(1313 ) 21.8426 Tj
0 -161.3871 Td
(1314 ) 21.8426 Tj
0 -170.8805 Td
(1315 ) 21.8426 Tj
0 -180.3739 Td
(1316 ) 21.8426 Tj
0 -189.8672 Td
(1317 ) 21.8426 Tj
0 -199.3606 Td
(1318 ) 21.8426 Tj
0 -208.8539 Td
(1319 ) 21.8426 Tj
0 -218.3473 Td
(1320 ) 21.8426 Tj
0 -227.8407 Td
(1321 ) 21.8426 Tj
0 -237.334 Td
(1322 ) 21.8426 Tj
0 -246.8274 Td
(1323 ) 21.8426 Tj
0 -256.3207 Td
(1324 ) 21.8426 Tj
0 -265.8141 Td
(1325 ) 21.8426 Tj
0 -275.3075 Td
(1326 ) 21.8426 Tj
0 -284.8008 Td
(1327 ) 21.8426 Tj
0 -294.2942 Td
(1328 ) 21.8426 Tj
0 -303.7875 Td
(1329 ) 21.8426 Tj
0 -313.2809 Td
(1330 ) 21.8426 Tj
0 -322.7743 Td
(1331 ) 21.8426 Tj
0 -332.2676 Td
(1332 ) 21.8426 Tj
0 -341.761 Td
(1333 ) 21.8426 Tj
0 -351.2543 Td
(1334 ) 21.8426 Tj
0 -360.7477 Td
(1335 ) 21.8426 Tj
0 -370.2411 Td
(1336 ) 21.8426 Tj
0 -379.7344 Td
(1337 ) 21.8426 Tj
0 -389.2278 Td
(1338 ) 21.8426 Tj
0 -398.7211 Td
(1339 ) 21.8426 Tj
0 -408.2145 Td
(1340 ) 21.8426 Tj
0 -417.7079 Td
(1341 ) 21.8426 Tj
0 -427.2012 Td
(1342 ) 21.8426 Tj
0 -436.6946 Td
(1343 ) 21.8426 Tj
0 -446.1879 Td
(1344 ) 21.8426 Tj
0 -455.6813 Td
(1345 ) 21.8426 Tj
0 -465.1747 Td
(1346 ) 21.8426 Tj
0 -474.668 Td
(1347 ) 21.8426 Tj
0 -484.1614 Td
(1348 ) 21.8426 Tj
0 -493.6547 Td
(1349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 13) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/spinlock.c  Page 1) 179.1091 Tj
0 -28.4801 Td
(1350 // Mutual exclusion spin locks.) 157.2665 Tj
0 -37.9735 Td
(1351 ) 21.8426 Tj
0 -47.4668 Td
(1352 #include "types.h") 100.4758 Tj
0 -56.9602 Td
(1353 #include "defs.h") 96.1073 Tj
0 -66.4535 Td
(1354 #include "param.h") 100.4758 Tj
0 -75.9469 Td
(1355 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(1356 #include "mmu.h") 91.7388 Tj
0 -94.9336 Td
(1357 #include "proc.h") 96.1073 Tj
0 -104.427 Td
(1358 #include "spinlock.h") 113.5814 Tj
0 -113.9203 Td
(1359 ) 21.8426 Tj
0 -123.4137 Td
(1360 extern int use_console_lock;) 144.161 Tj
0 -132.9071 Td
(1361 ) 21.8426 Tj
0 -142.4004 Td
(1362 void) 39.3166 Tj
0 -151.8938 Td
(1363 initlock\(struct spinlock *lock, char *name\)) 209.6887 Tj
0 -161.3871 Td
(1364 {) 26.2111 Tj
0 -170.8805 Td
(1365   lock->name = name;) 109.2129 Tj
0 -180.3739 Td
(1366   lock->locked = 0;) 104.8443 Tj
0 -189.8672 Td
(1367   lock->cpu = 0xffffffff;) 131.0554 Tj
0 -199.3606 Td
(1368 }) 26.2111 Tj
0 -208.8539 Td
(1369 ) 21.8426 Tj
0 -218.3473 Td
(1370 // Acquire the lock.) 109.2129 Tj
0 -227.8407 Td
(1371 // Loops \(spins\) until the lock is acquired.) 214.0572 Tj
0 -237.334 Td
(1372 // Holding a lock for a long time may cause) 209.6887 Tj
0 -246.8274 Td
(1373 // other CPUs to waste time spinning to acquire it.) 244.6368 Tj
0 -256.3207 Td
(1374 void) 39.3166 Tj
0 -265.8141 Td
(1375 acquire\(struct spinlock *lock\)) 152.898 Tj
0 -275.3075 Td
(1376 {) 26.2111 Tj
0 -284.8008 Td
(1377   pushcli\(\);) 74.2647 Tj
0 -294.2942 Td
(1378   if\(holding\(lock\)\)) 104.8443 Tj
0 -303.7875 Td
(1379     panic\("acquire"\);) 113.5814 Tj
0 -313.2809 Td
(1380 ) 21.8426 Tj
0 -322.7743 Td
(1381   // The xchg is atomic.) 126.6869 Tj
0 -332.2676 Td
(1382   // It also serializes, so that reads after acquire are n\
ot) 283.9534 Tj
0 -341.761 Td
(1383   // reordered before it.) 131.0554 Tj
0 -351.2543 Td
(1384   while\(xchg\(&lock->locked, 1\) == 1\)) 179.1091 Tj
0 -360.7477 Td
(1385     ;) 43.6851 Tj
0 -370.2411 Td
(1386 ) 21.8426 Tj
0 -379.7344 Td
(1387   // Record info about lock acquisition for debugging.) 257.7424 Tj
0 -389.2278 Td
(1388   // The +10 is only so that we can tell the difference) 262.1109 Tj
0 -398.7211 Td
(1389   // between forgetting to initialize lock->cpu) 227.1628 Tj
0 -408.2145 Td
(1390   // and holding a lock on cpu 0.) 166.0035 Tj
0 -417.7079 Td
(1391   lock->cpu = cpu\(\) + 10;) 131.0554 Tj
0 -427.2012 Td
(1392   getcallerpcs\(&lock, lock->pcs\);) 166.0035 Tj
0 -436.6946 Td
(1393 }) 26.2111 Tj
0 -446.1879 Td
(1394 ) 21.8426 Tj
0 -455.6813 Td
(1395 ) 21.8426 Tj
0 -465.1747 Td
(1396 ) 21.8426 Tj
0 -474.668 Td
(1397 ) 21.8426 Tj
0 -484.1614 Td
(1398 ) 21.8426 Tj
0 -493.6547 Td
(1399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 13) 34.9481 Tj
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[] 0 d
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q
180 3960 5760 3460 re
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[0] SC
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[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
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/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/spinlock.c  Page 2) 179.1091 Tj
0 -28.4801 Td
(1400 // Release the lock.) 109.2129 Tj
0 -37.9735 Td
(1401 void) 39.3166 Tj
0 -47.4668 Td
(1402 release\(struct spinlock *lock\)) 152.898 Tj
0 -56.9602 Td
(1403 {) 26.2111 Tj
0 -66.4535 Td
(1404   if\(!holding\(lock\)\)) 109.2129 Tj
0 -75.9469 Td
(1405     panic\("release"\);) 113.5814 Tj
0 -85.4403 Td
(1406 ) 21.8426 Tj
0 -94.9336 Td
(1407   lock->pcs[0] = 0;) 104.8443 Tj
0 -104.427 Td
(1408   lock->cpu = 0xffffffff;) 131.0554 Tj
0 -113.9203 Td
(1409 ) 21.8426 Tj
0 -123.4137 Td
(1410   // The xchg serializes, so that reads before release are) 275.2164 Tj
0 -132.9071 Td
(1411   // not reordered after it.  \(This reordering would be a\
llowed) 297.059 Tj
0 -142.4004 Td
(1412   // by the Intel manuals, but does not happen on current) 270.8479 Tj
0 -151.8938 Td
(1413   // Intel processors.  The xchg being asm volatile also k\
eeps) 292.6905 Tj
0 -161.3871 Td
(1414   // gcc from delaying the above assignments.\)) 222.7942 Tj
0 -170.8805 Td
(1415   xchg\(&lock->locked, 0\);) 131.0554 Tj
0 -180.3739 Td
(1416 ) 21.8426 Tj
0 -189.8672 Td
(1417   popcli\(\);) 69.8962 Tj
0 -199.3606 Td
(1418 }) 26.2111 Tj
0 -208.8539 Td
(1419 ) 21.8426 Tj
0 -218.3473 Td
(1420 // Record the current call stack in pcs[] by following the\
 %ebp chain.) 327.6386 Tj
0 -227.8407 Td
(1421 void) 39.3166 Tj
0 -237.334 Td
(1422 getcallerpcs\(void *v, uint pcs[]\)) 166.0035 Tj
0 -246.8274 Td
(1423 {) 26.2111 Tj
0 -256.3207 Td
(1424   uint *ebp;) 74.2647 Tj
0 -265.8141 Td
(1425   int i;) 56.7907 Tj
0 -275.3075 Td
(1426 ) 21.8426 Tj
0 -284.8008 Td
(1427   ebp = \(uint*\)v - 2;) 113.5814 Tj
0 -294.2942 Td
(1428   for\(i = 0; i < 10; i++\){) 135.4239 Tj
0 -303.7875 Td
(1429     if\(ebp == 0 || ebp == \(uint*\)0xffffffff\)) 214.0572 Tj
0 -313.2809 Td
(1430       break;) 74.2647 Tj
0 -322.7743 Td
(1431     pcs[i] = ebp[1];     // saved %eip) 187.8461 Tj
0 -332.2676 Td
(1432     ebp = \(uint*\)ebp[0]; // saved %ebp) 187.8461 Tj
0 -341.761 Td
(1433   }) 34.9481 Tj
0 -351.2543 Td
(1434   for\(; i < 10; i++\)) 109.2129 Tj
0 -360.7477 Td
(1435     pcs[i] = 0;) 87.3703 Tj
0 -370.2411 Td
(1436 }) 26.2111 Tj
0 -379.7344 Td
(1437 ) 21.8426 Tj
0 -389.2278 Td
(1438 // Check whether this cpu is holding the lock.) 222.7942 Tj
0 -398.7211 Td
(1439 int) 34.9481 Tj
0 -408.2145 Td
(1440 holding\(struct spinlock *lock\)) 152.898 Tj
0 -417.7079 Td
(1441 {) 26.2111 Tj
0 -427.2012 Td
(1442   return lock->locked && lock->cpu == cpu\(\) + 10;) 235.8998 Tj
0 -436.6946 Td
(1443 }) 26.2111 Tj
0 -446.1879 Td
(1444 ) 21.8426 Tj
0 -455.6813 Td
(1445 ) 21.8426 Tj
0 -465.1747 Td
(1446 ) 21.8426 Tj
0 -474.668 Td
(1447 ) 21.8426 Tj
0 -484.1614 Td
(1448 ) 21.8426 Tj
0 -493.6547 Td
(1449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 14) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/spinlock.c  Page 3) 179.1091 Tj
0 -28.4801 Td
(1450 // Pushcli/popcli are like cli/sti except that they are ma\
tched:) 301.4275 Tj
0 -37.9735 Td
(1451 // it takes two popcli to undo two pushcli.  Also, if inte\
rrupts) 301.4275 Tj
0 -47.4668 Td
(1452 // are off, then pushcli, popcli leaves them off.) 235.8998 Tj
0 -56.9602 Td
(1453 ) 21.8426 Tj
0 -66.4535 Td
(1454 void) 39.3166 Tj
0 -75.9469 Td
(1455 pushcli\(void\)) 78.6333 Tj
0 -85.4403 Td
(1456 {) 26.2111 Tj
0 -94.9336 Td
(1457   int eflags;) 78.6333 Tj
0 -104.427 Td
(1458 ) 21.8426 Tj
0 -113.9203 Td
(1459   eflags = read_eflags\(\);) 131.0554 Tj
0 -123.4137 Td
(1460   cli\(\);) 56.7907 Tj
0 -132.9071 Td
(1461   if\(cpus[cpu\(\)].ncli++ == 0\)) 148.5295 Tj
0 -142.4004 Td
(1462     cpus[cpu\(\)].intena = eflags & FL_IF;) 196.5831 Tj
0 -151.8938 Td
(1463 }) 26.2111 Tj
0 -161.3871 Td
(1464 ) 21.8426 Tj
0 -170.8805 Td
(1465 void) 39.3166 Tj
0 -180.3739 Td
(1466 popcli\(void\)) 74.2647 Tj
0 -189.8672 Td
(1467 {) 26.2111 Tj
0 -199.3606 Td
(1468   if\(read_eflags\(\)&FL_IF\)) 131.0554 Tj
0 -208.8539 Td
(1469     panic\("popcli - interruptible"\);) 179.1091 Tj
0 -218.3473 Td
(1470   if\(--cpus[cpu\(\)].ncli < 0\)) 144.161 Tj
0 -227.8407 Td
(1471     panic\("popcli"\);) 109.2129 Tj
0 -237.334 Td
(1472   if\(cpus[cpu\(\)].ncli == 0 && cpus[cpu\(\)].intena\)) 235.8998 Tj
0 -246.8274 Td
(1473     sti\(\);) 65.5277 Tj
0 -256.3207 Td
(1474 }) 26.2111 Tj
0 -265.8141 Td
(1475 ) 21.8426 Tj
0 -275.3075 Td
(1476 ) 21.8426 Tj
0 -284.8008 Td
(1477 ) 21.8426 Tj
0 -294.2942 Td
(1478 ) 21.8426 Tj
0 -303.7875 Td
(1479 ) 21.8426 Tj
0 -313.2809 Td
(1480 ) 21.8426 Tj
0 -322.7743 Td
(1481 ) 21.8426 Tj
0 -332.2676 Td
(1482 ) 21.8426 Tj
0 -341.761 Td
(1483 ) 21.8426 Tj
0 -351.2543 Td
(1484 ) 21.8426 Tj
0 -360.7477 Td
(1485 ) 21.8426 Tj
0 -370.2411 Td
(1486 ) 21.8426 Tj
0 -379.7344 Td
(1487 ) 21.8426 Tj
0 -389.2278 Td
(1488 ) 21.8426 Tj
0 -398.7211 Td
(1489 ) 21.8426 Tj
0 -408.2145 Td
(1490 ) 21.8426 Tj
0 -417.7079 Td
(1491 ) 21.8426 Tj
0 -427.2012 Td
(1492 ) 21.8426 Tj
0 -436.6946 Td
(1493 ) 21.8426 Tj
0 -446.1879 Td
(1494 ) 21.8426 Tj
0 -455.6813 Td
(1495 ) 21.8426 Tj
0 -465.1747 Td
(1496 ) 21.8426 Tj
0 -474.668 Td
(1497 ) 21.8426 Tj
0 -484.1614 Td
(1498 ) 21.8426 Tj
0 -493.6547 Td
(1499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 14) 34.9481 Tj
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0 0 612 792 re W
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[] 0 d
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/DeviceGray {} cs
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180 3960 5760 3460 re
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/proc.h  Page 1) 161.635 Tj
0 -28.4801 Td
(1500 // Segments in proc->gdt) 126.6869 Tj
0 -37.9735 Td
(1501 #define SEG_KCODE 1  // kernel code) 174.7406 Tj
0 -47.4668 Td
(1502 #define SEG_KDATA 2  // kernel data+stack) 200.9517 Tj
0 -56.9602 Td
(1503 #define SEG_UCODE 3) 104.8443 Tj
0 -66.4535 Td
(1504 #define SEG_UDATA 4) 104.8443 Tj
0 -75.9469 Td
(1505 #define SEG_TSS   5  // this process's task state) 235.8998 Tj
0 -85.4403 Td
(1506 #define NSEGS     6) 104.8443 Tj
0 -94.9336 Td
(1507 ) 21.8426 Tj
0 -104.427 Td
(1508 // Saved registers for kernel context switches.) 227.1628 Tj
0 -113.9203 Td
(1509 // Don't need to save all the %fs etc. segment registers,) 270.8479 Tj
0 -123.4137 Td
(1510 // because they are constant across kernel contexts.) 249.0053 Tj
0 -132.9071 Td
(1511 // Save all the regular registers so we don't need to care) 275.2164 Tj
0 -142.4004 Td
(1512 // which are caller save, but not the return register %eax\
.) 279.5849 Tj
0 -151.8938 Td
(1513 // \(Not saving %eax just simplifies the switching code.\)) 266.4794 Tj
0 -161.3871 Td
(1514 // The layout of context must match code in swtch.S.) 249.0053 Tj
0 -170.8805 Td
(1515 struct context {) 91.7388 Tj
0 -180.3739 Td
(1516   int eip;) 65.5277 Tj
0 -189.8672 Td
(1517   int esp;) 65.5277 Tj
0 -199.3606 Td
(1518   int ebx;) 65.5277 Tj
0 -208.8539 Td
(1519   int ecx;) 65.5277 Tj
0 -218.3473 Td
(1520   int edx;) 65.5277 Tj
0 -227.8407 Td
(1521   int esi;) 65.5277 Tj
0 -237.334 Td
(1522   int edi;) 65.5277 Tj
0 -246.8274 Td
(1523   int ebp;) 65.5277 Tj
0 -256.3207 Td
(1524 };) 30.5796 Tj
0 -265.8141 Td
(1525 ) 21.8426 Tj
0 -275.3075 Td
(1526 enum proc_state { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNN\
ING, ZOMBIE };) 336.3756 Tj
0 -284.8008 Td
(1527 ) 21.8426 Tj
0 -294.2942 Td
(1528 // Per-process state) 109.2129 Tj
0 -303.7875 Td
(1529 struct proc {) 78.6333 Tj
0 -313.2809 Td
(1530   char *mem;                // Start of process memory \(k\
ernel address\)) 332.0071 Tj
0 -322.7743 Td
(1531   uint sz;                  // Size of process memory \(by\
tes\)) 288.322 Tj
0 -332.2676 Td
(1532   char *kstack;             // Bottom of kernel stack for \
this process) 327.6386 Tj
0 -341.761 Td
(1533   enum proc_state state;    // Process state) 214.0572 Tj
0 -351.2543 Td
(1534   int pid;                  // Process ID) 200.9517 Tj
0 -360.7477 Td
(1535   struct proc *parent;      // Parent process) 218.4257 Tj
0 -370.2411 Td
(1536   void *chan;               // If non-zero, sleeping on ch\
an) 283.9534 Tj
0 -379.7344 Td
(1537   int killed;               // If non-zero, have been kill\
ed) 283.9534 Tj
0 -389.2278 Td
(1538   struct file *ofile[NOFILE];  // Open files) 214.0572 Tj
0 -398.7211 Td
(1539   struct inode *cwd;        // Current directory) 231.5313 Tj
0 -408.2145 Td
(1540   struct context context;   // Switch here to run process) 270.8479 Tj
0 -417.7079 Td
(1541   struct trapframe *tf;     // Trap frame for current inte\
rrupt) 297.059 Tj
0 -427.2012 Td
(1542   char name[16];            // Process name \(debugging\)) 262.1109 Tj
0 -436.6946 Td
(1543 };) 30.5796 Tj
0 -446.1879 Td
(1544 ) 21.8426 Tj
0 -455.6813 Td
(1545 ) 21.8426 Tj
0 -465.1747 Td
(1546 ) 21.8426 Tj
0 -474.668 Td
(1547 ) 21.8426 Tj
0 -484.1614 Td
(1548 ) 21.8426 Tj
0 -493.6547 Td
(1549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 15) 34.9481 Tj
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180 500 5760 3460 re
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/DeviceGray {} CS
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/DeviceGray {} cs
[0] sc
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[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:04 2008  xv6/proc.h  Page 2) 161.635 Tj
0 -28.4801 Td
(1550 // Process memory is laid out contiguously, low addresses \
first:) 301.4275 Tj
0 -37.9735 Td
(1551 //   text) 61.1592 Tj
0 -47.4668 Td
(1552 //   original data and bss) 135.4239 Tj
0 -56.9602 Td
(1553 //   fixed-size stack) 113.5814 Tj
0 -66.4535 Td
(1554 //   expandable heap) 109.2129 Tj
0 -75.9469 Td
(1555 ) 21.8426 Tj
0 -85.4403 Td
(1556 // Per-CPU state) 91.7388 Tj
0 -94.9336 Td
(1557 struct cpu {) 74.2647 Tj
0 -104.427 Td
(1558   uchar apicid;               // Local APIC ID) 222.7942 Tj
0 -113.9203 Td
(1559   struct proc *curproc;       // Process currently running\
.) 279.5849 Tj
0 -123.4137 Td
(1560   struct context context;     // Switch here to enter sche\
duler) 297.059 Tj
0 -132.9071 Td
(1561   struct taskstate ts;        // Used by x86 to find stack\
 for interrupt) 336.3756 Tj
0 -142.4004 Td
(1562   struct segdesc gdt[NSEGS];  // x86 global descriptor tab\
le) 283.9534 Tj
0 -151.8938 Td
(1563   volatile uint booted;        // Has the CPU started?) 257.7424 Tj
0 -161.3871 Td
(1564   int ncli;                   // Depth of pushcli nesting.) 275.2164 Tj
0 -170.8805 Td
(1565   int intena;                 // Were interrupts enabled b\
efore pushcli?) 336.3756 Tj
0 -180.3739 Td
(1566 };) 30.5796 Tj
0 -189.8672 Td
(1567 ) 21.8426 Tj
0 -199.3606 Td
(1568 extern struct cpu cpus[NCPU];) 148.5295 Tj
0 -208.8539 Td
(1569 extern int ncpu;) 91.7388 Tj
0 -218.3473 Td
(1570 ) 21.8426 Tj
0 -227.8407 Td
(1571 // "cp" is a short alias for curproc\(\).) 192.2146 Tj
0 -237.334 Td
(1572 // It gets used enough to make this worthwhile.) 227.1628 Tj
0 -246.8274 Td
(1573 #define cp curproc\(\)) 109.2129 Tj
0 -256.3207 Td
(1574 ) 21.8426 Tj
0 -265.8141 Td
(1575 ) 21.8426 Tj
0 -275.3075 Td
(1576 ) 21.8426 Tj
0 -284.8008 Td
(1577 ) 21.8426 Tj
0 -294.2942 Td
(1578 ) 21.8426 Tj
0 -303.7875 Td
(1579 ) 21.8426 Tj
0 -313.2809 Td
(1580 ) 21.8426 Tj
0 -322.7743 Td
(1581 ) 21.8426 Tj
0 -332.2676 Td
(1582 ) 21.8426 Tj
0 -341.761 Td
(1583 ) 21.8426 Tj
0 -351.2543 Td
(1584 ) 21.8426 Tj
0 -360.7477 Td
(1585 ) 21.8426 Tj
0 -370.2411 Td
(1586 ) 21.8426 Tj
0 -379.7344 Td
(1587 ) 21.8426 Tj
0 -389.2278 Td
(1588 ) 21.8426 Tj
0 -398.7211 Td
(1589 ) 21.8426 Tj
0 -408.2145 Td
(1590 ) 21.8426 Tj
0 -417.7079 Td
(1591 ) 21.8426 Tj
0 -427.2012 Td
(1592 ) 21.8426 Tj
0 -436.6946 Td
(1593 ) 21.8426 Tj
0 -446.1879 Td
(1594 ) 21.8426 Tj
0 -455.6813 Td
(1595 ) 21.8426 Tj
0 -465.1747 Td
(1596 ) 21.8426 Tj
0 -474.668 Td
(1597 ) 21.8426 Tj
0 -484.1614 Td
(1598 ) 21.8426 Tj
0 -493.6547 Td
(1599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 15) 34.9481 Tj
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[] 0 d
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180 3960 5760 3460 re
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0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/proc.c  Page 1) 161.635 Tj
0 -28.4801 Td
(1600 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(1601 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(1602 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(1603 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(1604 #include "x86.h") 91.7388 Tj
0 -75.9469 Td
(1605 #include "proc.h") 96.1073 Tj
0 -85.4403 Td
(1606 #include "spinlock.h") 113.5814 Tj
0 -94.9336 Td
(1607 ) 21.8426 Tj
0 -104.427 Td
(1608 struct spinlock proc_table_lock;) 161.635 Tj
0 -113.9203 Td
(1609 ) 21.8426 Tj
0 -123.4137 Td
(1610 struct proc proc[NPROC];) 126.6869 Tj
0 -132.9071 Td
(1611 static struct proc *initproc;) 148.5295 Tj
0 -142.4004 Td
(1612 ) 21.8426 Tj
0 -151.8938 Td
(1613 int nextpid = 1;) 91.7388 Tj
0 -161.3871 Td
(1614 extern void forkret\(void\);) 135.4239 Tj
0 -170.8805 Td
(1615 extern void forkret1\(struct trapframe*\);) 196.5831 Tj
0 -180.3739 Td
(1616 ) 21.8426 Tj
0 -189.8672 Td
(1617 void) 39.3166 Tj
0 -199.3606 Td
(1618 pinit\(void\)) 69.8962 Tj
0 -208.8539 Td
(1619 {) 26.2111 Tj
0 -218.3473 Td
(1620   initlock\(&proc_table_lock, "proc_table"\);) 209.6887 Tj
0 -227.8407 Td
(1621 }) 26.2111 Tj
0 -237.334 Td
(1622 ) 21.8426 Tj
0 -246.8274 Td
(1623 // Look in the process table for an UNUSED proc.) 231.5313 Tj
0 -256.3207 Td
(1624 // If found, change state to EMBRYO and return it.) 240.2683 Tj
0 -265.8141 Td
(1625 // Otherwise return 0.) 117.9499 Tj
0 -275.3075 Td
(1626 static struct proc*) 104.8443 Tj
0 -284.8008 Td
(1627 allocproc\(void\)) 87.3703 Tj
0 -294.2942 Td
(1628 {) 26.2111 Tj
0 -303.7875 Td
(1629   int i;) 56.7907 Tj
0 -313.2809 Td
(1630   struct proc *p;) 96.1073 Tj
0 -322.7743 Td
(1631 ) 21.8426 Tj
0 -332.2676 Td
(1632   acquire\(&proc_table_lock\);) 144.161 Tj
0 -341.761 Td
(1633   for\(i = 0; i < NPROC; i++\){) 148.5295 Tj
0 -351.2543 Td
(1634     p = &proc[i];) 96.1073 Tj
0 -360.7477 Td
(1635     if\(p->state == UNUSED\){) 139.7925 Tj
0 -370.2411 Td
(1636       p->state = EMBRYO;) 126.6869 Tj
0 -379.7344 Td
(1637       p->pid = nextpid++;) 131.0554 Tj
0 -389.2278 Td
(1638       release\(&proc_table_lock\);) 161.635 Tj
0 -398.7211 Td
(1639       return p;) 87.3703 Tj
0 -408.2145 Td
(1640     }) 43.6851 Tj
0 -417.7079 Td
(1641   }) 34.9481 Tj
0 -427.2012 Td
(1642   release\(&proc_table_lock\);) 144.161 Tj
0 -436.6946 Td
(1643   return 0;) 69.8962 Tj
0 -446.1879 Td
(1644 }) 26.2111 Tj
0 -455.6813 Td
(1645 ) 21.8426 Tj
0 -465.1747 Td
(1646 ) 21.8426 Tj
0 -474.668 Td
(1647 ) 21.8426 Tj
0 -484.1614 Td
(1648 ) 21.8426 Tj
0 -493.6547 Td
(1649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 16) 34.9481 Tj
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Q
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180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/proc.c  Page 2) 161.635 Tj
0 -28.4801 Td
(1650 // Grow current process's memory by n bytes.) 214.0572 Tj
0 -37.9735 Td
(1651 // Return old size on success, -1 on failure.) 218.4257 Tj
0 -47.4668 Td
(1652 int) 34.9481 Tj
0 -56.9602 Td
(1653 growproc\(int n\)) 87.3703 Tj
0 -66.4535 Td
(1654 {) 26.2111 Tj
0 -75.9469 Td
(1655   char *newmem;) 87.3703 Tj
0 -85.4403 Td
(1656 ) 21.8426 Tj
0 -94.9336 Td
(1657   newmem = kalloc\(cp->sz + n\);) 152.898 Tj
0 -104.427 Td
(1658   if\(newmem == 0\)) 96.1073 Tj
0 -113.9203 Td
(1659     return -1;) 83.0018 Tj
0 -123.4137 Td
(1660   memmove\(newmem, cp->mem, cp->sz\);) 174.7406 Tj
0 -132.9071 Td
(1661   memset\(newmem + cp->sz, 0, n\);) 161.635 Tj
0 -142.4004 Td
(1662   kfree\(cp->mem, cp->sz\);) 131.0554 Tj
0 -151.8938 Td
(1663   cp->mem = newmem;) 104.8443 Tj
0 -161.3871 Td
(1664   cp->sz += n;) 83.0018 Tj
0 -170.8805 Td
(1665   setupsegs\(cp\);) 91.7388 Tj
0 -180.3739 Td
(1666   return cp->sz - n;) 109.2129 Tj
0 -189.8672 Td
(1667 }) 26.2111 Tj
0 -199.3606 Td
(1668 ) 21.8426 Tj
0 -208.8539 Td
(1669 // Set up CPU's segment descriptors and task state for a g\
iven process.) 332.0071 Tj
0 -218.3473 Td
(1670 // If p==0, set up for "idle" state for when scheduler\(\)\
 is running.) 318.9016 Tj
0 -227.8407 Td
(1671 void) 39.3166 Tj
0 -237.334 Td
(1672 setupsegs\(struct proc *p\)) 131.0554 Tj
0 -246.8274 Td
(1673 {) 26.2111 Tj
0 -256.3207 Td
(1674   struct cpu *c;) 91.7388 Tj
0 -265.8141 Td
(1675 ) 21.8426 Tj
0 -275.3075 Td
(1676   pushcli\(\);) 74.2647 Tj
0 -284.8008 Td
(1677   c = &cpus[cpu\(\)];) 104.8443 Tj
0 -294.2942 Td
(1678   c->ts.ss0 = SEG_KDATA << 3;) 148.5295 Tj
0 -303.7875 Td
(1679   if\(p\)) 52.4222 Tj
0 -313.2809 Td
(1680     c->ts.esp0 = \(uint\)\(p->kstack + KSTACKSIZE\);) 231.5313 Tj
0 -322.7743 Td
(1681   else) 48.0537 Tj
0 -332.2676 Td
(1682     c->ts.esp0 = 0xffffffff;) 144.161 Tj
0 -341.761 Td
(1683 ) 21.8426 Tj
0 -351.2543 Td
(1684   c->gdt[0] = SEG_NULL;) 122.3184 Tj
0 -360.7477 Td
(1685   c->gdt[SEG_KCODE] = SEG\(STA_X|STA_R, 0, 0x100000 + 64*1\
024-1, 0\);) 314.533 Tj
0 -370.2411 Td
(1686   c->gdt[SEG_KDATA] = SEG\(STA_W, 0, 0xffffffff, 0\);) 244.6368 Tj
0 -379.7344 Td
(1687   c->gdt[SEG_TSS] = SEG16\(STS_T32A, \(uint\)&c->ts, sizeo\
f\(c->ts\)-1, 0\);) 327.6386 Tj
0 -389.2278 Td
(1688   c->gdt[SEG_TSS].s = 0;) 126.6869 Tj
0 -398.7211 Td
(1689   if\(p\){) 56.7907 Tj
0 -408.2145 Td
(1690     c->gdt[SEG_UCODE] = SEG\(STA_X|STA_R, \(uint\)p->mem, \
p->sz-1, DPL_USER\);) 345.1126 Tj
0 -417.7079 Td
(1691     c->gdt[SEG_UDATA] = SEG\(STA_W, \(uint\)p->mem, p->sz-\
1, DPL_USER\);) 318.9016 Tj
0 -427.2012 Td
(1692   } else {) 65.5277 Tj
0 -436.6946 Td
(1693     c->gdt[SEG_UCODE] = SEG_NULL;) 166.0035 Tj
0 -446.1879 Td
(1694     c->gdt[SEG_UDATA] = SEG_NULL;) 166.0035 Tj
0 -455.6813 Td
(1695   }) 34.9481 Tj
0 -465.1747 Td
(1696 ) 21.8426 Tj
0 -474.668 Td
(1697 ) 21.8426 Tj
0 -484.1614 Td
(1698 ) 21.8426 Tj
0 -493.6547 Td
(1699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 16) 34.9481 Tj
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showpage
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-612 -792 translate
0 0 612 792 re W
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[] 0 d
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[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/proc.c  Page 3) 161.635 Tj
0 -28.4801 Td
(1700   lgdt\(c->gdt, sizeof\(c->gdt\)\);) 157.2665 Tj
0 -37.9735 Td
(1701   ltr\(SEG_TSS << 3\);) 109.2129 Tj
0 -47.4668 Td
(1702   popcli\(\);) 69.8962 Tj
0 -56.9602 Td
(1703 }) 26.2111 Tj
0 -66.4535 Td
(1704 ) 21.8426 Tj
0 -75.9469 Td
(1705 // Create a new process copying p as the parent.) 231.5313 Tj
0 -85.4403 Td
(1706 // Sets up stack to return as if from system call.) 240.2683 Tj
0 -94.9336 Td
(1707 // Caller must set state of returned proc to RUNNABLE.) 257.7424 Tj
0 -104.427 Td
(1708 struct proc*) 74.2647 Tj
0 -113.9203 Td
(1709 copyproc\(struct proc *p\)) 126.6869 Tj
0 -123.4137 Td
(1710 {) 26.2111 Tj
0 -132.9071 Td
(1711   int i;) 56.7907 Tj
0 -142.4004 Td
(1712   struct proc *np;) 100.4758 Tj
0 -151.8938 Td
(1713 ) 21.8426 Tj
0 -161.3871 Td
(1714   // Allocate process.) 117.9499 Tj
0 -170.8805 Td
(1715   if\(\(np = allocproc\(\)\) == 0\)) 148.5295 Tj
0 -180.3739 Td
(1716     return 0;) 78.6333 Tj
0 -189.8672 Td
(1717 ) 21.8426 Tj
0 -199.3606 Td
(1718   // Allocate kernel stack.) 139.7925 Tj
0 -208.8539 Td
(1719   if\(\(np->kstack = kalloc\(KSTACKSIZE\)\) == 0\){) 218.4257 Tj
0 -218.3473 Td
(1720     np->state = UNUSED;) 122.3184 Tj
0 -227.8407 Td
(1721     return 0;) 78.6333 Tj
0 -237.334 Td
(1722   }) 34.9481 Tj
0 -246.8274 Td
(1723   np->tf = \(struct trapframe*\)\(np->kstack + KSTACKSIZE\)\
 - 1;) 283.9534 Tj
0 -256.3207 Td
(1724 ) 21.8426 Tj
0 -265.8141 Td
(1725   if\(p\){  // Copy process state from p.) 192.2146 Tj
0 -275.3075 Td
(1726     np->parent = p;) 104.8443 Tj
0 -284.8008 Td
(1727     memmove\(np->tf, p->tf, sizeof\(*np->tf\)\);) 214.0572 Tj
0 -294.2942 Td
(1728 ) 21.8426 Tj
0 -303.7875 Td
(1729     np->sz = p->sz;) 104.8443 Tj
0 -313.2809 Td
(1730     if\(\(np->mem = kalloc\(np->sz\)\) == 0\){) 196.5831 Tj
0 -322.7743 Td
(1731       kfree\(np->kstack, KSTACKSIZE\);) 179.1091 Tj
0 -332.2676 Td
(1732       np->kstack = 0;) 113.5814 Tj
0 -341.761 Td
(1733       np->state = UNUSED;) 131.0554 Tj
0 -351.2543 Td
(1734       np->parent = 0;) 113.5814 Tj
0 -360.7477 Td
(1735       return 0;) 87.3703 Tj
0 -370.2411 Td
(1736     }) 43.6851 Tj
0 -379.7344 Td
(1737     memmove\(np->mem, p->mem, np->sz\);) 183.4776 Tj
0 -389.2278 Td
(1738 ) 21.8426 Tj
0 -398.7211 Td
(1739     for\(i = 0; i < NOFILE; i++\)) 157.2665 Tj
0 -408.2145 Td
(1740       if\(p->ofile[i]\)) 113.5814 Tj
0 -417.7079 Td
(1741         np->ofile[i] = filedup\(p->ofile[i]\);) 214.0572 Tj
0 -427.2012 Td
(1742     np->cwd = idup\(p->cwd\);) 139.7925 Tj
0 -436.6946 Td
(1743   }) 34.9481 Tj
0 -446.1879 Td
(1744 ) 21.8426 Tj
0 -455.6813 Td
(1745   // Set up new context to start executing at forkret \(se\
e below\).) 310.1645 Tj
0 -465.1747 Td
(1746   memset\(&np->context, 0, sizeof\(np->context\)\);) 227.1628 Tj
0 -474.668 Td
(1747   np->context.eip = \(uint\)forkret;) 170.3721 Tj
0 -484.1614 Td
(1748   np->context.esp = \(uint\)np->tf;) 166.0035 Tj
0 -493.6547 Td
(1749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 17) 34.9481 Tj
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180 500 5760 3460 re
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/DeviceGray {} CS
[0] SC
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[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/proc.c  Page 4) 161.635 Tj
0 -28.4801 Td
(1750   // Clear %eax so that fork system call returns 0 in chil\
d.) 283.9534 Tj
0 -37.9735 Td
(1751   np->tf->eax = 0;) 100.4758 Tj
0 -47.4668 Td
(1752   return np;) 74.2647 Tj
0 -56.9602 Td
(1753 }) 26.2111 Tj
0 -66.4535 Td
(1754 ) 21.8426 Tj
0 -75.9469 Td
(1755 // Set up first user process.) 148.5295 Tj
0 -85.4403 Td
(1756 void) 39.3166 Tj
0 -94.9336 Td
(1757 userinit\(void\)) 83.0018 Tj
0 -104.427 Td
(1758 {) 26.2111 Tj
0 -113.9203 Td
(1759   struct proc *p;) 96.1073 Tj
0 -123.4137 Td
(1760   extern uchar _binary_initcode_start[], _binary_initcode_\
size[];) 305.796 Tj
0 -132.9071 Td
(1761 ) 21.8426 Tj
0 -142.4004 Td
(1762   p = copyproc\(0\);) 100.4758 Tj
0 -151.8938 Td
(1763   p->sz = PAGE;) 87.3703 Tj
0 -161.3871 Td
(1764   p->mem = kalloc\(p->sz\);) 131.0554 Tj
0 -170.8805 Td
(1765   p->cwd = namei\("/"\);) 117.9499 Tj
0 -180.3739 Td
(1766   memset\(p->tf, 0, sizeof\(*p->tf\)\);) 174.7406 Tj
0 -189.8672 Td
(1767   p->tf->cs = \(SEG_UCODE << 3\) | DPL_USER;) 205.3202 Tj
0 -199.3606 Td
(1768   p->tf->ds = \(SEG_UDATA << 3\) | DPL_USER;) 205.3202 Tj
0 -208.8539 Td
(1769   p->tf->es = p->tf->ds;) 126.6869 Tj
0 -218.3473 Td
(1770   p->tf->ss = p->tf->ds;) 126.6869 Tj
0 -227.8407 Td
(1771   p->tf->eflags = FL_IF;) 126.6869 Tj
0 -237.334 Td
(1772   p->tf->esp = p->sz;) 113.5814 Tj
0 -246.8274 Td
(1773 ) 21.8426 Tj
0 -256.3207 Td
(1774   // Make return address readable; needed for some gcc.) 262.1109 Tj
0 -265.8141 Td
(1775   p->tf->esp -= 4;) 100.4758 Tj
0 -275.3075 Td
(1776   *\(uint*\)\(p->mem + p->tf->esp\) = 0xefefefef;) 218.4257 Tj
0 -284.8008 Td
(1777 ) 21.8426 Tj
0 -294.2942 Td
(1778   // On entry to user space, start executing at beginning \
of initcode.S.) 336.3756 Tj
0 -303.7875 Td
(1779   p->tf->eip = 0;) 96.1073 Tj
0 -313.2809 Td
(1780   memmove\(p->mem, _binary_initcode_start, \(int\)_binary_\
initcode_size\);) 327.6386 Tj
0 -322.7743 Td
(1781   safestrcpy\(p->name, "initcode", sizeof\(p->name\)\);) 244.6368 Tj
0 -332.2676 Td
(1782   p->state = RUNNABLE;) 117.9499 Tj
0 -341.761 Td
(1783 ) 21.8426 Tj
0 -351.2543 Td
(1784   initproc = p;) 87.3703 Tj
0 -360.7477 Td
(1785 }) 26.2111 Tj
0 -370.2411 Td
(1786 ) 21.8426 Tj
0 -379.7344 Td
(1787 // Return currently running process.) 179.1091 Tj
0 -389.2278 Td
(1788 struct proc*) 74.2647 Tj
0 -398.7211 Td
(1789 curproc\(void\)) 78.6333 Tj
0 -408.2145 Td
(1790 {) 26.2111 Tj
0 -417.7079 Td
(1791   struct proc *p;) 96.1073 Tj
0 -427.2012 Td
(1792 ) 21.8426 Tj
0 -436.6946 Td
(1793   pushcli\(\);) 74.2647 Tj
0 -446.1879 Td
(1794   p = cpus[cpu\(\)].curproc;) 135.4239 Tj
0 -455.6813 Td
(1795   popcli\(\);) 69.8962 Tj
0 -465.1747 Td
(1796   return p;) 69.8962 Tj
0 -474.668 Td
(1797 }) 26.2111 Tj
0 -484.1614 Td
(1798 ) 21.8426 Tj
0 -493.6547 Td
(1799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 17) 34.9481 Tj
Q
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%%Page: 25 25
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0 0 612 792 re W
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[] 0 d
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180 3960 5760 3460 re
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0 0 Td
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(Sep  3 10:05 2008  xv6/proc.c  Page 5) 161.635 Tj
0 -28.4801 Td
(1800 // Per-CPU process scheduler.) 148.5295 Tj
0 -37.9735 Td
(1801 // Each CPU calls scheduler\(\) after setting itself up.) 257.7424 Tj
0 -47.4668 Td
(1802 // Scheduler never returns.  It loops, doing:) 218.4257 Tj
0 -56.9602 Td
(1803 //  - choose a process to run) 148.5295 Tj
0 -66.4535 Td
(1804 //  - swtch to start running that process) 200.9517 Tj
0 -75.9469 Td
(1805 //  - eventually that process transfers control) 227.1628 Tj
0 -85.4403 Td
(1806 //      via swtch back to the scheduler.) 196.5831 Tj
0 -94.9336 Td
(1807 void) 39.3166 Tj
0 -104.427 Td
(1808 scheduler\(void\)) 87.3703 Tj
0 -113.9203 Td
(1809 {) 26.2111 Tj
0 -123.4137 Td
(1810   struct proc *p;) 96.1073 Tj
0 -132.9071 Td
(1811   struct cpu *c;) 91.7388 Tj
0 -142.4004 Td
(1812   int i;) 56.7907 Tj
0 -151.8938 Td
(1813 ) 21.8426 Tj
0 -161.3871 Td
(1814   c = &cpus[cpu\(\)];) 104.8443 Tj
0 -170.8805 Td
(1815   for\(;;\){) 65.5277 Tj
0 -180.3739 Td
(1816     // Enable interrupts on this processor.) 209.6887 Tj
0 -189.8672 Td
(1817     sti\(\);) 65.5277 Tj
0 -199.3606 Td
(1818 ) 21.8426 Tj
0 -208.8539 Td
(1819     // Loop over process table looking for process to run.) 275.2164 Tj
0 -218.3473 Td
(1820     acquire\(&proc_table_lock\);) 152.898 Tj
0 -227.8407 Td
(1821     for\(i = 0; i < NPROC; i++\){) 157.2665 Tj
0 -237.334 Td
(1822       p = &proc[i];) 104.8443 Tj
0 -246.8274 Td
(1823       if\(p->state != RUNNABLE\)) 152.898 Tj
0 -256.3207 Td
(1824         continue;) 96.1073 Tj
0 -265.8141 Td
(1825 ) 21.8426 Tj
0 -275.3075 Td
(1826       // Switch to chosen process.  It is the process's jo\
b) 279.5849 Tj
0 -284.8008 Td
(1827       // to release proc_table_lock and then reacquire it) 270.8479 Tj
0 -294.2942 Td
(1828       // before jumping back to us.) 174.7406 Tj
0 -303.7875 Td
(1829       c->curproc = p;) 113.5814 Tj
0 -313.2809 Td
(1830       setupsegs\(p\);) 104.8443 Tj
0 -322.7743 Td
(1831       p->state = RUNNING;) 131.0554 Tj
0 -332.2676 Td
(1832       swtch\(&c->context, &p->context\);) 187.8461 Tj
0 -341.761 Td
(1833 ) 21.8426 Tj
0 -351.2543 Td
(1834       // Process is done running for now.) 200.9517 Tj
0 -360.7477 Td
(1835       // It should have changed its p->state before coming\
 back.) 301.4275 Tj
0 -370.2411 Td
(1836       c->curproc = 0;) 113.5814 Tj
0 -379.7344 Td
(1837       setupsegs\(0\);) 104.8443 Tj
0 -389.2278 Td
(1838     }) 43.6851 Tj
0 -398.7211 Td
(1839     release\(&proc_table_lock\);) 152.898 Tj
0 -408.2145 Td
(1840 ) 21.8426 Tj
0 -417.7079 Td
(1841   }) 34.9481 Tj
0 -427.2012 Td
(1842 }) 26.2111 Tj
0 -436.6946 Td
(1843 ) 21.8426 Tj
0 -446.1879 Td
(1844 ) 21.8426 Tj
0 -455.6813 Td
(1845 ) 21.8426 Tj
0 -465.1747 Td
(1846 ) 21.8426 Tj
0 -474.668 Td
(1847 ) 21.8426 Tj
0 -484.1614 Td
(1848 ) 21.8426 Tj
0 -493.6547 Td
(1849 ) 21.8426 Tj
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(Sheet 18) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/proc.c  Page 6) 161.635 Tj
0 -28.4801 Td
(1850 // Enter scheduler.  Must already hold proc_table_lock) 257.7424 Tj
0 -37.9735 Td
(1851 // and have changed curproc[cpu\(\)]->state.) 205.3202 Tj
0 -47.4668 Td
(1852 void) 39.3166 Tj
0 -56.9602 Td
(1853 sched\(void\)) 69.8962 Tj
0 -66.4535 Td
(1854 {) 26.2111 Tj
0 -75.9469 Td
(1855   if\(read_eflags\(\)&FL_IF\)) 131.0554 Tj
0 -85.4403 Td
(1856     panic\("sched interruptible"\);) 166.0035 Tj
0 -94.9336 Td
(1857   if\(cp->state == RUNNING\)) 135.4239 Tj
0 -104.427 Td
(1858     panic\("sched running"\);) 139.7925 Tj
0 -113.9203 Td
(1859   if\(!holding\(&proc_table_lock\)\)) 161.635 Tj
0 -123.4137 Td
(1860     panic\("sched proc_table_lock"\);) 174.7406 Tj
0 -132.9071 Td
(1861   if\(cpus[cpu\(\)].ncli != 1\)) 139.7925 Tj
0 -142.4004 Td
(1862     panic\("sched locks"\);) 131.0554 Tj
0 -151.8938 Td
(1863 ) 21.8426 Tj
0 -161.3871 Td
(1864   swtch\(&cp->context, &cpus[cpu\(\)].context\);) 214.0572 Tj
0 -170.8805 Td
(1865 }) 26.2111 Tj
0 -180.3739 Td
(1866 ) 21.8426 Tj
0 -189.8672 Td
(1867 // Give up the CPU for one scheduling round.) 214.0572 Tj
0 -199.3606 Td
(1868 void) 39.3166 Tj
0 -208.8539 Td
(1869 yield\(void\)) 69.8962 Tj
0 -218.3473 Td
(1870 {) 26.2111 Tj
0 -227.8407 Td
(1871   acquire\(&proc_table_lock\);) 144.161 Tj
0 -237.334 Td
(1872   cp->state = RUNNABLE;) 122.3184 Tj
0 -246.8274 Td
(1873   sched\(\);) 65.5277 Tj
0 -256.3207 Td
(1874   release\(&proc_table_lock\);) 144.161 Tj
0 -265.8141 Td
(1875 }) 26.2111 Tj
0 -275.3075 Td
(1876 ) 21.8426 Tj
0 -284.8008 Td
(1877 // A fork child's very first scheduling by scheduler\(\)) 257.7424 Tj
0 -294.2942 Td
(1878 // will swtch here.  "Return" to user space.) 214.0572 Tj
0 -303.7875 Td
(1879 void) 39.3166 Tj
0 -313.2809 Td
(1880 forkret\(void\)) 78.6333 Tj
0 -322.7743 Td
(1881 {) 26.2111 Tj
0 -332.2676 Td
(1882   // Still holding proc_table_lock from scheduler.) 240.2683 Tj
0 -341.761 Td
(1883   release\(&proc_table_lock\);) 144.161 Tj
0 -351.2543 Td
(1884 ) 21.8426 Tj
0 -360.7477 Td
(1885   // Jump into assembly, never to return.) 200.9517 Tj
0 -370.2411 Td
(1886   forkret1\(cp->tf\);) 104.8443 Tj
0 -379.7344 Td
(1887 }) 26.2111 Tj
0 -389.2278 Td
(1888 ) 21.8426 Tj
0 -398.7211 Td
(1889 ) 21.8426 Tj
0 -408.2145 Td
(1890 ) 21.8426 Tj
0 -417.7079 Td
(1891 ) 21.8426 Tj
0 -427.2012 Td
(1892 ) 21.8426 Tj
0 -436.6946 Td
(1893 ) 21.8426 Tj
0 -446.1879 Td
(1894 ) 21.8426 Tj
0 -455.6813 Td
(1895 ) 21.8426 Tj
0 -465.1747 Td
(1896 ) 21.8426 Tj
0 -474.668 Td
(1897 ) 21.8426 Tj
0 -484.1614 Td
(1898 ) 21.8426 Tj
0 -493.6547 Td
(1899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 18) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/proc.c  Page 7) 161.635 Tj
0 -28.4801 Td
(1900 // Atomically release lock and sleep on chan.) 218.4257 Tj
0 -37.9735 Td
(1901 // Reacquires lock when reawakened.) 174.7406 Tj
0 -47.4668 Td
(1902 void) 39.3166 Tj
0 -56.9602 Td
(1903 sleep\(void *chan, struct spinlock *lk\)) 187.8461 Tj
0 -66.4535 Td
(1904 {) 26.2111 Tj
0 -75.9469 Td
(1905   if\(cp == 0\)) 78.6333 Tj
0 -85.4403 Td
(1906     panic\("sleep"\);) 104.8443 Tj
0 -94.9336 Td
(1907 ) 21.8426 Tj
0 -104.427 Td
(1908   if\(lk == 0\)) 78.6333 Tj
0 -113.9203 Td
(1909     panic\("sleep without lk"\);) 152.898 Tj
0 -123.4137 Td
(1910 ) 21.8426 Tj
0 -132.9071 Td
(1911   // Must acquire proc_table_lock in order to) 218.4257 Tj
0 -142.4004 Td
(1912   // change p->state and then call sched.) 200.9517 Tj
0 -151.8938 Td
(1913   // Once we hold proc_table_lock, we can be) 214.0572 Tj
0 -161.3871 Td
(1914   // guaranteed that we won't miss any wakeup) 218.4257 Tj
0 -170.8805 Td
(1915   // \(wakeup runs with proc_table_lock locked\),) 227.1628 Tj
0 -180.3739 Td
(1916   // so it's okay to release lk.) 161.635 Tj
0 -189.8672 Td
(1917   if\(lk != &proc_table_lock\){) 148.5295 Tj
0 -199.3606 Td
(1918     acquire\(&proc_table_lock\);) 152.898 Tj
0 -208.8539 Td
(1919     release\(lk\);) 91.7388 Tj
0 -218.3473 Td
(1920   }) 34.9481 Tj
0 -227.8407 Td
(1921 ) 21.8426 Tj
0 -237.334 Td
(1922   // Go to sleep.) 96.1073 Tj
0 -246.8274 Td
(1923   cp->chan = chan;) 100.4758 Tj
0 -256.3207 Td
(1924   cp->state = SLEEPING;) 122.3184 Tj
0 -265.8141 Td
(1925   sched\(\);) 65.5277 Tj
0 -275.3075 Td
(1926 ) 21.8426 Tj
0 -284.8008 Td
(1927   // Tidy up.) 78.6333 Tj
0 -294.2942 Td
(1928   cp->chan = 0;) 87.3703 Tj
0 -303.7875 Td
(1929 ) 21.8426 Tj
0 -313.2809 Td
(1930   // Reacquire original lock.) 148.5295 Tj
0 -322.7743 Td
(1931   if\(lk != &proc_table_lock\){) 148.5295 Tj
0 -332.2676 Td
(1932     release\(&proc_table_lock\);) 152.898 Tj
0 -341.761 Td
(1933     acquire\(lk\);) 91.7388 Tj
0 -351.2543 Td
(1934   }) 34.9481 Tj
0 -360.7477 Td
(1935 }) 26.2111 Tj
0 -370.2411 Td
(1936 ) 21.8426 Tj
0 -379.7344 Td
(1937 ) 21.8426 Tj
0 -389.2278 Td
(1938 ) 21.8426 Tj
0 -398.7211 Td
(1939 ) 21.8426 Tj
0 -408.2145 Td
(1940 ) 21.8426 Tj
0 -417.7079 Td
(1941 ) 21.8426 Tj
0 -427.2012 Td
(1942 ) 21.8426 Tj
0 -436.6946 Td
(1943 ) 21.8426 Tj
0 -446.1879 Td
(1944 ) 21.8426 Tj
0 -455.6813 Td
(1945 ) 21.8426 Tj
0 -465.1747 Td
(1946 ) 21.8426 Tj
0 -474.668 Td
(1947 ) 21.8426 Tj
0 -484.1614 Td
(1948 ) 21.8426 Tj
0 -493.6547 Td
(1949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 19) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/proc.c  Page 8) 161.635 Tj
0 -28.4801 Td
(1950 // Wake up all processes sleeping on chan.) 205.3202 Tj
0 -37.9735 Td
(1951 // Proc_table_lock must be held.) 161.635 Tj
0 -47.4668 Td
(1952 static void) 69.8962 Tj
0 -56.9602 Td
(1953 wakeup1\(void *chan\)) 104.8443 Tj
0 -66.4535 Td
(1954 {) 26.2111 Tj
0 -75.9469 Td
(1955   struct proc *p;) 96.1073 Tj
0 -85.4403 Td
(1956 ) 21.8426 Tj
0 -94.9336 Td
(1957   for\(p = proc; p < &proc[NPROC]; p++\)) 187.8461 Tj
0 -104.427 Td
(1958     if\(p->state == SLEEPING && p->chan == chan\)) 227.1628 Tj
0 -113.9203 Td
(1959       p->state = RUNNABLE;) 135.4239 Tj
0 -123.4137 Td
(1960 }) 26.2111 Tj
0 -132.9071 Td
(1961 ) 21.8426 Tj
0 -142.4004 Td
(1962 // Wake up all processes sleeping on chan.) 205.3202 Tj
0 -151.8938 Td
(1963 // Proc_table_lock is acquired and released.) 214.0572 Tj
0 -161.3871 Td
(1964 void) 39.3166 Tj
0 -170.8805 Td
(1965 wakeup\(void *chan\)) 100.4758 Tj
0 -180.3739 Td
(1966 {) 26.2111 Tj
0 -189.8672 Td
(1967   acquire\(&proc_table_lock\);) 144.161 Tj
0 -199.3606 Td
(1968   wakeup1\(chan\);) 91.7388 Tj
0 -208.8539 Td
(1969   release\(&proc_table_lock\);) 144.161 Tj
0 -218.3473 Td
(1970 }) 26.2111 Tj
0 -227.8407 Td
(1971 ) 21.8426 Tj
0 -237.334 Td
(1972 // Kill the process with the given pid.) 192.2146 Tj
0 -246.8274 Td
(1973 // Process won't actually exit until it returns) 227.1628 Tj
0 -256.3207 Td
(1974 // to user space \(see trap in trap.c\).) 187.8461 Tj
0 -265.8141 Td
(1975 int) 34.9481 Tj
0 -275.3075 Td
(1976 kill\(int pid\)) 78.6333 Tj
0 -284.8008 Td
(1977 {) 26.2111 Tj
0 -294.2942 Td
(1978   struct proc *p;) 96.1073 Tj
0 -303.7875 Td
(1979 ) 21.8426 Tj
0 -313.2809 Td
(1980   acquire\(&proc_table_lock\);) 144.161 Tj
0 -322.7743 Td
(1981   for\(p = proc; p < &proc[NPROC]; p++\){) 192.2146 Tj
0 -332.2676 Td
(1982     if\(p->pid == pid\){) 117.9499 Tj
0 -341.761 Td
(1983       p->killed = 1;) 109.2129 Tj
0 -351.2543 Td
(1984       // Wake process from sleep if necessary.) 222.7942 Tj
0 -360.7477 Td
(1985       if\(p->state == SLEEPING\)) 152.898 Tj
0 -370.2411 Td
(1986         p->state = RUNNABLE;) 144.161 Tj
0 -379.7344 Td
(1987       release\(&proc_table_lock\);) 161.635 Tj
0 -389.2278 Td
(1988       return 0;) 87.3703 Tj
0 -398.7211 Td
(1989     }) 43.6851 Tj
0 -408.2145 Td
(1990   }) 34.9481 Tj
0 -417.7079 Td
(1991   release\(&proc_table_lock\);) 144.161 Tj
0 -427.2012 Td
(1992   return -1;) 74.2647 Tj
0 -436.6946 Td
(1993 }) 26.2111 Tj
0 -446.1879 Td
(1994 ) 21.8426 Tj
0 -455.6813 Td
(1995 ) 21.8426 Tj
0 -465.1747 Td
(1996 ) 21.8426 Tj
0 -474.668 Td
(1997 ) 21.8426 Tj
0 -484.1614 Td
(1998 ) 21.8426 Tj
0 -493.6547 Td
(1999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 19) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/proc.c  Page 9) 161.635 Tj
0 -28.4801 Td
(2000 // Exit the current process.  Does not return.) 222.7942 Tj
0 -37.9735 Td
(2001 // Exited processes remain in the zombie state) 222.7942 Tj
0 -47.4668 Td
(2002 // until their parent calls wait\(\) to find out they exit\
ed.) 279.5849 Tj
0 -56.9602 Td
(2003 void) 39.3166 Tj
0 -66.4535 Td
(2004 exit\(void\)) 65.5277 Tj
0 -75.9469 Td
(2005 {) 26.2111 Tj
0 -85.4403 Td
(2006   struct proc *p;) 96.1073 Tj
0 -94.9336 Td
(2007   int fd;) 61.1592 Tj
0 -104.427 Td
(2008 ) 21.8426 Tj
0 -113.9203 Td
(2009   if\(cp == initproc\)) 109.2129 Tj
0 -123.4137 Td
(2010     panic\("init exiting"\);) 135.4239 Tj
0 -132.9071 Td
(2011 ) 21.8426 Tj
0 -142.4004 Td
(2012   // Close all open files.) 135.4239 Tj
0 -151.8938 Td
(2013   for\(fd = 0; fd < NOFILE; fd++\){) 166.0035 Tj
0 -161.3871 Td
(2014     if\(cp->ofile[fd]\){) 117.9499 Tj
0 -170.8805 Td
(2015       fileclose\(cp->ofile[fd]\);) 157.2665 Tj
0 -180.3739 Td
(2016       cp->ofile[fd] = 0;) 126.6869 Tj
0 -189.8672 Td
(2017     }) 43.6851 Tj
0 -199.3606 Td
(2018   }) 34.9481 Tj
0 -208.8539 Td
(2019 ) 21.8426 Tj
0 -218.3473 Td
(2020   iput\(cp->cwd\);) 91.7388 Tj
0 -227.8407 Td
(2021   cp->cwd = 0;) 83.0018 Tj
0 -237.334 Td
(2022 ) 21.8426 Tj
0 -246.8274 Td
(2023   acquire\(&proc_table_lock\);) 144.161 Tj
0 -256.3207 Td
(2024 ) 21.8426 Tj
0 -265.8141 Td
(2025   // Parent might be sleeping in wait\(\).) 196.5831 Tj
0 -275.3075 Td
(2026   wakeup1\(cp->parent\);) 117.9499 Tj
0 -284.8008 Td
(2027 ) 21.8426 Tj
0 -294.2942 Td
(2028   // Pass abandoned children to init.) 183.4776 Tj
0 -303.7875 Td
(2029   for\(p = proc; p < &proc[NPROC]; p++\){) 192.2146 Tj
0 -313.2809 Td
(2030     if\(p->parent == cp\){) 126.6869 Tj
0 -322.7743 Td
(2031       p->parent = initproc;) 139.7925 Tj
0 -332.2676 Td
(2032       if\(p->state == ZOMBIE\)) 144.161 Tj
0 -341.761 Td
(2033         wakeup1\(initproc\);) 135.4239 Tj
0 -351.2543 Td
(2034     }) 43.6851 Tj
0 -360.7477 Td
(2035   }) 34.9481 Tj
0 -370.2411 Td
(2036 ) 21.8426 Tj
0 -379.7344 Td
(2037   // Jump into the scheduler, never to return.) 222.7942 Tj
0 -389.2278 Td
(2038   cp->killed = 0;) 96.1073 Tj
0 -398.7211 Td
(2039   cp->state = ZOMBIE;) 113.5814 Tj
0 -408.2145 Td
(2040   sched\(\);) 65.5277 Tj
0 -417.7079 Td
(2041   panic\("zombie exit"\);) 122.3184 Tj
0 -427.2012 Td
(2042 }) 26.2111 Tj
0 -436.6946 Td
(2043 ) 21.8426 Tj
0 -446.1879 Td
(2044 ) 21.8426 Tj
0 -455.6813 Td
(2045 ) 21.8426 Tj
0 -465.1747 Td
(2046 ) 21.8426 Tj
0 -474.668 Td
(2047 ) 21.8426 Tj
0 -484.1614 Td
(2048 ) 21.8426 Tj
0 -493.6547 Td
(2049 ) 21.8426 Tj
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(Sheet 20) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/proc.c  Page 10) 166.0035 Tj
0 -28.4801 Td
(2050 // Wait for a child process to exit and return its pid.) 262.1109 Tj
0 -37.9735 Td
(2051 // Return -1 if this process has no children.) 218.4257 Tj
0 -47.4668 Td
(2052 int) 34.9481 Tj
0 -56.9602 Td
(2053 wait\(void\)) 65.5277 Tj
0 -66.4535 Td
(2054 {) 26.2111 Tj
0 -75.9469 Td
(2055   struct proc *p;) 96.1073 Tj
0 -85.4403 Td
(2056   int i, havekids, pid;) 122.3184 Tj
0 -94.9336 Td
(2057 ) 21.8426 Tj
0 -104.427 Td
(2058   acquire\(&proc_table_lock\);) 144.161 Tj
0 -113.9203 Td
(2059   for\(;;\){) 65.5277 Tj
0 -123.4137 Td
(2060     // Scan through table looking for zombie children.) 257.7424 Tj
0 -132.9071 Td
(2061     havekids = 0;) 96.1073 Tj
0 -142.4004 Td
(2062     for\(i = 0; i < NPROC; i++\){) 157.2665 Tj
0 -151.8938 Td
(2063       p = &proc[i];) 104.8443 Tj
0 -161.3871 Td
(2064       if\(p->state == UNUSED\)) 144.161 Tj
0 -170.8805 Td
(2065         continue;) 96.1073 Tj
0 -180.3739 Td
(2066       if\(p->parent == cp\){) 135.4239 Tj
0 -189.8672 Td
(2067         if\(p->state == ZOMBIE\){) 157.2665 Tj
0 -199.3606 Td
(2068           // Found one.) 122.3184 Tj
0 -208.8539 Td
(2069           kfree\(p->mem, p->sz\);) 157.2665 Tj
0 -218.3473 Td
(2070           kfree\(p->kstack, KSTACKSIZE\);) 192.2146 Tj
0 -227.8407 Td
(2071           pid = p->pid;) 122.3184 Tj
0 -237.334 Td
(2072           p->state = UNUSED;) 144.161 Tj
0 -246.8274 Td
(2073           p->pid = 0;) 113.5814 Tj
0 -256.3207 Td
(2074           p->parent = 0;) 126.6869 Tj
0 -265.8141 Td
(2075           p->name[0] = 0;) 131.0554 Tj
0 -275.3075 Td
(2076           release\(&proc_table_lock\);) 179.1091 Tj
0 -284.8008 Td
(2077           return pid;) 113.5814 Tj
0 -294.2942 Td
(2078         }) 61.1592 Tj
0 -303.7875 Td
(2079         havekids = 1;) 113.5814 Tj
0 -313.2809 Td
(2080       }) 52.4222 Tj
0 -322.7743 Td
(2081     }) 43.6851 Tj
0 -332.2676 Td
(2082 ) 21.8426 Tj
0 -341.761 Td
(2083     // No point waiting if we don't have any children.) 257.7424 Tj
0 -351.2543 Td
(2084     if\(!havekids || cp->killed\){) 161.635 Tj
0 -360.7477 Td
(2085       release\(&proc_table_lock\);) 161.635 Tj
0 -370.2411 Td
(2086       return -1;) 91.7388 Tj
0 -379.7344 Td
(2087     }) 43.6851 Tj
0 -389.2278 Td
(2088 ) 21.8426 Tj
0 -398.7211 Td
(2089     // Wait for children to exit.  \(See wakeup1 call in p\
roc_exit.\)) 314.533 Tj
0 -408.2145 Td
(2090     sleep\(cp, &proc_table_lock\);) 161.635 Tj
0 -417.7079 Td
(2091   }) 34.9481 Tj
0 -427.2012 Td
(2092 }) 26.2111 Tj
0 -436.6946 Td
(2093 ) 21.8426 Tj
0 -446.1879 Td
(2094 ) 21.8426 Tj
0 -455.6813 Td
(2095 ) 21.8426 Tj
0 -465.1747 Td
(2096 ) 21.8426 Tj
0 -474.668 Td
(2097 ) 21.8426 Tj
0 -484.1614 Td
(2098 ) 21.8426 Tj
0 -493.6547 Td
(2099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 20) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 28 28
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/proc.c  Page 11) 166.0035 Tj
0 -28.4801 Td
(2100 // Print a process listing to console.  For debugging.) 257.7424 Tj
0 -37.9735 Td
(2101 // Runs when user types ^P on console.) 187.8461 Tj
0 -47.4668 Td
(2102 // No lock to avoid wedging a stuck machine further.) 249.0053 Tj
0 -56.9602 Td
(2103 void) 39.3166 Tj
0 -66.4535 Td
(2104 procdump\(void\)) 83.0018 Tj
0 -75.9469 Td
(2105 {) 26.2111 Tj
0 -85.4403 Td
(2106   static char *states[] = {) 139.7925 Tj
0 -94.9336 Td
(2107   [UNUSED]    "unused",) 122.3184 Tj
0 -104.427 Td
(2108   [EMBRYO]    "embryo",) 122.3184 Tj
0 -113.9203 Td
(2109   [SLEEPING]  "sleep ",) 122.3184 Tj
0 -123.4137 Td
(2110   [RUNNABLE]  "runble",) 122.3184 Tj
0 -132.9071 Td
(2111   [RUNNING]   "run   ",) 122.3184 Tj
0 -142.4004 Td
(2112   [ZOMBIE]    "zombie") 117.9499 Tj
0 -151.8938 Td
(2113   };) 39.3166 Tj
0 -161.3871 Td
(2114   int i, j;) 69.8962 Tj
0 -170.8805 Td
(2115   struct proc *p;) 96.1073 Tj
0 -180.3739 Td
(2116   char *state;) 83.0018 Tj
0 -189.8672 Td
(2117   uint pc[10];) 83.0018 Tj
0 -199.3606 Td
(2118 ) 21.8426 Tj
0 -208.8539 Td
(2119   for\(i = 0; i < NPROC; i++\){) 148.5295 Tj
0 -218.3473 Td
(2120     p = &proc[i];) 96.1073 Tj
0 -227.8407 Td
(2121     if\(p->state == UNUSED\)) 135.4239 Tj
0 -237.334 Td
(2122       continue;) 87.3703 Tj
0 -246.8274 Td
(2123     if\(p->state >= 0 && p->state < NELEM\(states\) && sta\
tes[p->state]\)) 323.2701 Tj
0 -256.3207 Td
(2124       state = states[p->state];) 157.2665 Tj
0 -265.8141 Td
(2125     else) 56.7907 Tj
0 -275.3075 Td
(2126       state = "???";) 109.2129 Tj
0 -284.8008 Td
(2127     cprintf\("%d %s %s", p->pid, state, p->name\);) 231.5313 Tj
0 -294.2942 Td
(2128     if\(p->state == SLEEPING\){) 148.5295 Tj
0 -303.7875 Td
(2129       getcallerpcs\(\(uint*\)p->context.ebp+2, pc\);) 231.5313 Tj
0 -313.2809 Td
(2130       for\(j=0; j<10 && pc[j] != 0; j++\)) 192.2146 Tj
0 -322.7743 Td
(2131         cprintf\(" %p", pc[j]\);) 152.898 Tj
0 -332.2676 Td
(2132     }) 43.6851 Tj
0 -341.761 Td
(2133     cprintf\("\\n"\);) 100.4758 Tj
0 -351.2543 Td
(2134   }) 34.9481 Tj
0 -360.7477 Td
(2135 }) 26.2111 Tj
0 -370.2411 Td
(2136 ) 21.8426 Tj
0 -379.7344 Td
(2137 ) 21.8426 Tj
0 -389.2278 Td
(2138 ) 21.8426 Tj
0 -398.7211 Td
(2139 ) 21.8426 Tj
0 -408.2145 Td
(2140 ) 21.8426 Tj
0 -417.7079 Td
(2141 ) 21.8426 Tj
0 -427.2012 Td
(2142 ) 21.8426 Tj
0 -436.6946 Td
(2143 ) 21.8426 Tj
0 -446.1879 Td
(2144 ) 21.8426 Tj
0 -455.6813 Td
(2145 ) 21.8426 Tj
0 -465.1747 Td
(2146 ) 21.8426 Tj
0 -474.668 Td
(2147 ) 21.8426 Tj
0 -484.1614 Td
(2148 ) 21.8426 Tj
0 -493.6547 Td
(2149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 21) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/swtch.S  Page 1) 166.0035 Tj
0 -28.4801 Td
(2150 #   void swtch\(struct context *old, struct context *new\)\
;) 270.8479 Tj
0 -37.9735 Td
(2151 #) 26.2111 Tj
0 -47.4668 Td
(2152 # Save current register context in old) 187.8461 Tj
0 -56.9602 Td
(2153 # and then load register context from new.) 205.3202 Tj
0 -66.4535 Td
(2154 ) 21.8426 Tj
0 -75.9469 Td
(2155 .globl swtch) 74.2647 Tj
0 -85.4403 Td
(2156 swtch:) 48.0537 Tj
0 -94.9336 Td
(2157   # Save old registers) 117.9499 Tj
0 -104.427 Td
(2158   movl 4\(%esp\), %eax) 109.2129 Tj
0 -113.9203 Td
(2159 ) 21.8426 Tj
0 -123.4137 Td
(2160   popl 0\(%eax\)  # %eip) 117.9499 Tj
0 -132.9071 Td
(2161   movl %esp, 4\(%eax\)) 109.2129 Tj
0 -142.4004 Td
(2162   movl %ebx, 8\(%eax\)) 109.2129 Tj
0 -151.8938 Td
(2163   movl %ecx, 12\(%eax\)) 113.5814 Tj
0 -161.3871 Td
(2164   movl %edx, 16\(%eax\)) 113.5814 Tj
0 -170.8805 Td
(2165   movl %esi, 20\(%eax\)) 113.5814 Tj
0 -180.3739 Td
(2166   movl %edi, 24\(%eax\)) 113.5814 Tj
0 -189.8672 Td
(2167   movl %ebp, 28\(%eax\)) 113.5814 Tj
0 -199.3606 Td
(2168 ) 21.8426 Tj
0 -208.8539 Td
(2169   # Load new registers) 117.9499 Tj
0 -218.3473 Td
(2170   movl 4\(%esp\), %eax  # not 8\(%esp\) - popped return ad\
dress above) 305.796 Tj
0 -227.8407 Td
(2171 ) 21.8426 Tj
0 -237.334 Td
(2172   movl 28\(%eax\), %ebp) 113.5814 Tj
0 -246.8274 Td
(2173   movl 24\(%eax\), %edi) 113.5814 Tj
0 -256.3207 Td
(2174   movl 20\(%eax\), %esi) 113.5814 Tj
0 -265.8141 Td
(2175   movl 16\(%eax\), %edx) 113.5814 Tj
0 -275.3075 Td
(2176   movl 12\(%eax\), %ecx) 113.5814 Tj
0 -284.8008 Td
(2177   movl 8\(%eax\), %ebx) 109.2129 Tj
0 -294.2942 Td
(2178   movl 4\(%eax\), %esp) 109.2129 Tj
0 -303.7875 Td
(2179   pushl 0\(%eax\)  # %eip) 122.3184 Tj
0 -313.2809 Td
(2180 ) 21.8426 Tj
0 -322.7743 Td
(2181   ret) 43.6851 Tj
0 -332.2676 Td
(2182 ) 21.8426 Tj
0 -341.761 Td
(2183 ) 21.8426 Tj
0 -351.2543 Td
(2184 ) 21.8426 Tj
0 -360.7477 Td
(2185 ) 21.8426 Tj
0 -370.2411 Td
(2186 ) 21.8426 Tj
0 -379.7344 Td
(2187 ) 21.8426 Tj
0 -389.2278 Td
(2188 ) 21.8426 Tj
0 -398.7211 Td
(2189 ) 21.8426 Tj
0 -408.2145 Td
(2190 ) 21.8426 Tj
0 -417.7079 Td
(2191 ) 21.8426 Tj
0 -427.2012 Td
(2192 ) 21.8426 Tj
0 -436.6946 Td
(2193 ) 21.8426 Tj
0 -446.1879 Td
(2194 ) 21.8426 Tj
0 -455.6813 Td
(2195 ) 21.8426 Tj
0 -465.1747 Td
(2196 ) 21.8426 Tj
0 -474.668 Td
(2197 ) 21.8426 Tj
0 -484.1614 Td
(2198 ) 21.8426 Tj
0 -493.6547 Td
(2199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 21) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 29 29
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/kalloc.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(2200 // Physical memory allocator, intended to allocate) 240.2683 Tj
0 -37.9735 Td
(2201 // memory for user processes. Allocates in 4096-byte "page\
s".) 288.322 Tj
0 -47.4668 Td
(2202 // Free list is kept sorted and combines adjacent pages in\
to) 283.9534 Tj
0 -56.9602 Td
(2203 // long runs, to make it easier to allocate big segments.) 270.8479 Tj
0 -66.4535 Td
(2204 // One reason the page size is 4k is that the x86 segment \
size) 292.6905 Tj
0 -75.9469 Td
(2205 // granularity is 4k.) 113.5814 Tj
0 -85.4403 Td
(2206 ) 21.8426 Tj
0 -94.9336 Td
(2207 #include "types.h") 100.4758 Tj
0 -104.427 Td
(2208 #include "defs.h") 96.1073 Tj
0 -113.9203 Td
(2209 #include "param.h") 100.4758 Tj
0 -123.4137 Td
(2210 #include "spinlock.h") 113.5814 Tj
0 -132.9071 Td
(2211 ) 21.8426 Tj
0 -142.4004 Td
(2212 struct spinlock kalloc_lock;) 144.161 Tj
0 -151.8938 Td
(2213 ) 21.8426 Tj
0 -161.3871 Td
(2214 struct run {) 74.2647 Tj
0 -170.8805 Td
(2215   struct run *next;) 104.8443 Tj
0 -180.3739 Td
(2216   int len; // bytes) 104.8443 Tj
0 -189.8672 Td
(2217 };) 30.5796 Tj
0 -199.3606 Td
(2218 struct run *freelist;) 113.5814 Tj
0 -208.8539 Td
(2219 ) 21.8426 Tj
0 -218.3473 Td
(2220 // Initialize free list of physical pages.) 205.3202 Tj
0 -227.8407 Td
(2221 // This code cheats by just considering one megabyte of) 262.1109 Tj
0 -237.334 Td
(2222 // pages after _end.  Real systems would determine the) 257.7424 Tj
0 -246.8274 Td
(2223 // amount of memory available in the system and use it all\
.) 279.5849 Tj
0 -256.3207 Td
(2224 void) 39.3166 Tj
0 -265.8141 Td
(2225 kinit\(void\)) 69.8962 Tj
0 -275.3075 Td
(2226 {) 26.2111 Tj
0 -284.8008 Td
(2227   extern int end;) 96.1073 Tj
0 -294.2942 Td
(2228   uint mem;) 69.8962 Tj
0 -303.7875 Td
(2229   char *start;) 83.0018 Tj
0 -313.2809 Td
(2230 ) 21.8426 Tj
0 -322.7743 Td
(2231   initlock\(&kalloc_lock, "kalloc"\);) 174.7406 Tj
0 -332.2676 Td
(2232   start = \(char*\) &end;) 122.3184 Tj
0 -341.761 Td
(2233   start = \(char*\) \(\(\(uint\)start + PAGE\) & ~\(PAGE-1\
\)\);) 253.3738 Tj
0 -351.2543 Td
(2234   mem = 256; // assume computer has 256 pages of RAM) 249.0053 Tj
0 -360.7477 Td
(2235   cprintf\("mem = %d\\n", mem * PAGE\);) 179.1091 Tj
0 -370.2411 Td
(2236   kfree\(start, mem * PAGE\);) 139.7925 Tj
0 -379.7344 Td
(2237 }) 26.2111 Tj
0 -389.2278 Td
(2238 ) 21.8426 Tj
0 -398.7211 Td
(2239 ) 21.8426 Tj
0 -408.2145 Td
(2240 ) 21.8426 Tj
0 -417.7079 Td
(2241 ) 21.8426 Tj
0 -427.2012 Td
(2242 ) 21.8426 Tj
0 -436.6946 Td
(2243 ) 21.8426 Tj
0 -446.1879 Td
(2244 ) 21.8426 Tj
0 -455.6813 Td
(2245 ) 21.8426 Tj
0 -465.1747 Td
(2246 ) 21.8426 Tj
0 -474.668 Td
(2247 ) 21.8426 Tj
0 -484.1614 Td
(2248 ) 21.8426 Tj
0 -493.6547 Td
(2249 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 22) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/kalloc.c  Page 2) 170.3721 Tj
0 -28.4801 Td
(2250 // Free the len bytes of memory pointed at by v,) 231.5313 Tj
0 -37.9735 Td
(2251 // which normally should have been returned by a) 231.5313 Tj
0 -47.4668 Td
(2252 // call to kalloc\(len\).  \(The exception is when) 227.1628 Tj
0 -56.9602 Td
(2253 // initializing the allocator; see kinit above.\)) 231.5313 Tj
0 -66.4535 Td
(2254 void) 39.3166 Tj
0 -75.9469 Td
(2255 kfree\(char *v, int len\)) 122.3184 Tj
0 -85.4403 Td
(2256 {) 26.2111 Tj
0 -94.9336 Td
(2257   struct run *r, *rend, **rp, *p, *pend;) 196.5831 Tj
0 -104.427 Td
(2258 ) 21.8426 Tj
0 -113.9203 Td
(2259   if\(len <= 0 || len % PAGE\)) 144.161 Tj
0 -123.4137 Td
(2260     panic\("kfree"\);) 104.8443 Tj
0 -132.9071 Td
(2261 ) 21.8426 Tj
0 -142.4004 Td
(2262   // Fill with junk to catch dangling refs.) 209.6887 Tj
0 -151.8938 Td
(2263   memset\(v, 1, len\);) 109.2129 Tj
0 -161.3871 Td
(2264 ) 21.8426 Tj
0 -170.8805 Td
(2265   acquire\(&kalloc_lock\);) 126.6869 Tj
0 -180.3739 Td
(2266   p = \(struct run*\)v;) 113.5814 Tj
0 -189.8672 Td
(2267   pend = \(struct run*\)\(v + len\);) 161.635 Tj
0 -199.3606 Td
(2268   for\(rp=&freelist; \(r=*rp\) != 0 && r <= pend; rp=&r->n\
ext\){) 283.9534 Tj
0 -208.8539 Td
(2269     rend = \(struct run*\)\(\(char*\)r + r->len\);) 214.0572 Tj
0 -218.3473 Td
(2270     if\(r <= p && p < rend\)) 135.4239 Tj
0 -227.8407 Td
(2271       panic\("freeing free page"\);) 166.0035 Tj
0 -237.334 Td
(2272     if\(pend == r\){  // p next to r: replace r with p) 249.0053 Tj
0 -246.8274 Td
(2273       p->len = len + r->len;) 144.161 Tj
0 -256.3207 Td
(2274       p->next = r->next;) 126.6869 Tj
0 -265.8141 Td
(2275       *rp = p;) 83.0018 Tj
0 -275.3075 Td
(2276       goto out;) 87.3703 Tj
0 -284.8008 Td
(2277     }) 43.6851 Tj
0 -294.2942 Td
(2278     if\(rend == p\){  // r next to p: replace p with r) 249.0053 Tj
0 -303.7875 Td
(2279       r->len += len;) 109.2129 Tj
0 -313.2809 Td
(2280       if\(r->next && r->next == pend\){  // r now next to \
r->next?) 301.4275 Tj
0 -322.7743 Td
(2281         r->len += r->next->len;) 157.2665 Tj
0 -332.2676 Td
(2282         r->next = r->next->next;) 161.635 Tj
0 -341.761 Td
(2283       }) 52.4222 Tj
0 -351.2543 Td
(2284       goto out;) 87.3703 Tj
0 -360.7477 Td
(2285     }) 43.6851 Tj
0 -370.2411 Td
(2286   }) 34.9481 Tj
0 -379.7344 Td
(2287   // Insert p before r in list.) 157.2665 Tj
0 -389.2278 Td
(2288   p->len = len;) 87.3703 Tj
0 -398.7211 Td
(2289   p->next = r;) 83.0018 Tj
0 -408.2145 Td
(2290   *rp = p;) 65.5277 Tj
0 -417.7079 Td
(2291 ) 21.8426 Tj
0 -427.2012 Td
(2292  out:) 43.6851 Tj
0 -436.6946 Td
(2293   release\(&kalloc_lock\);) 126.6869 Tj
0 -446.1879 Td
(2294 }) 26.2111 Tj
0 -455.6813 Td
(2295 ) 21.8426 Tj
0 -465.1747 Td
(2296 ) 21.8426 Tj
0 -474.668 Td
(2297 ) 21.8426 Tj
0 -484.1614 Td
(2298 ) 21.8426 Tj
0 -493.6547 Td
(2299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 22) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 30 30
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/kalloc.c  Page 3) 170.3721 Tj
0 -28.4801 Td
(2300 // Allocate n bytes of physical memory.) 192.2146 Tj
0 -37.9735 Td
(2301 // Returns a kernel-segment pointer.) 179.1091 Tj
0 -47.4668 Td
(2302 // Returns 0 if the memory cannot be allocated.) 227.1628 Tj
0 -56.9602 Td
(2303 char*) 43.6851 Tj
0 -66.4535 Td
(2304 kalloc\(int n\)) 78.6333 Tj
0 -75.9469 Td
(2305 {) 26.2111 Tj
0 -85.4403 Td
(2306   char *p;) 65.5277 Tj
0 -94.9336 Td
(2307   struct run *r, **rp;) 117.9499 Tj
0 -104.427 Td
(2308 ) 21.8426 Tj
0 -113.9203 Td
(2309   if\(n % PAGE || n <= 0\)) 126.6869 Tj
0 -123.4137 Td
(2310     panic\("kalloc"\);) 109.2129 Tj
0 -132.9071 Td
(2311 ) 21.8426 Tj
0 -142.4004 Td
(2312   acquire\(&kalloc_lock\);) 126.6869 Tj
0 -151.8938 Td
(2313   for\(rp=&freelist; \(r=*rp\) != 0; rp=&r->next\){) 227.1628 Tj
0 -161.3871 Td
(2314     if\(r->len == n\){) 109.2129 Tj
0 -170.8805 Td
(2315       *rp = r->next;) 109.2129 Tj
0 -180.3739 Td
(2316       release\(&kalloc_lock\);) 144.161 Tj
0 -189.8672 Td
(2317       return \(char*\)r;) 117.9499 Tj
0 -199.3606 Td
(2318     }) 43.6851 Tj
0 -208.8539 Td
(2319     if\(r->len > n\){) 104.8443 Tj
0 -218.3473 Td
(2320       r->len -= n;) 100.4758 Tj
0 -227.8407 Td
(2321       p = \(char*\)r + r->len;) 144.161 Tj
0 -237.334 Td
(2322       release\(&kalloc_lock\);) 144.161 Tj
0 -246.8274 Td
(2323       return p;) 87.3703 Tj
0 -256.3207 Td
(2324     }) 43.6851 Tj
0 -265.8141 Td
(2325   }) 34.9481 Tj
0 -275.3075 Td
(2326   release\(&kalloc_lock\);) 126.6869 Tj
0 -284.8008 Td
(2327 ) 21.8426 Tj
0 -294.2942 Td
(2328   cprintf\("kalloc: out of memory\\n"\);) 183.4776 Tj
0 -303.7875 Td
(2329   return 0;) 69.8962 Tj
0 -313.2809 Td
(2330 }) 26.2111 Tj
0 -322.7743 Td
(2331 ) 21.8426 Tj
0 -332.2676 Td
(2332 ) 21.8426 Tj
0 -341.761 Td
(2333 ) 21.8426 Tj
0 -351.2543 Td
(2334 ) 21.8426 Tj
0 -360.7477 Td
(2335 ) 21.8426 Tj
0 -370.2411 Td
(2336 ) 21.8426 Tj
0 -379.7344 Td
(2337 ) 21.8426 Tj
0 -389.2278 Td
(2338 ) 21.8426 Tj
0 -398.7211 Td
(2339 ) 21.8426 Tj
0 -408.2145 Td
(2340 ) 21.8426 Tj
0 -417.7079 Td
(2341 ) 21.8426 Tj
0 -427.2012 Td
(2342 ) 21.8426 Tj
0 -436.6946 Td
(2343 ) 21.8426 Tj
0 -446.1879 Td
(2344 ) 21.8426 Tj
0 -455.6813 Td
(2345 ) 21.8426 Tj
0 -465.1747 Td
(2346 ) 21.8426 Tj
0 -474.668 Td
(2347 ) 21.8426 Tj
0 -484.1614 Td
(2348 ) 21.8426 Tj
0 -493.6547 Td
(2349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 23) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/traps.h  Page 1) 166.0035 Tj
0 -28.4801 Td
(2350 // x86 trap and interrupt constants.) 179.1091 Tj
0 -37.9735 Td
(2351 ) 21.8426 Tj
0 -47.4668 Td
(2352 // Processor-defined:) 113.5814 Tj
0 -56.9602 Td
(2353 #define T_DIVIDE         0      // divide error) 227.1628 Tj
0 -66.4535 Td
(2354 #define T_DEBUG          1      // debug exception) 240.2683 Tj
0 -75.9469 Td
(2355 #define T_NMI            2      // non-maskable interrupt) 270.8479 Tj
0 -85.4403 Td
(2356 #define T_BRKPT          3      // breakpoint) 218.4257 Tj
0 -94.9336 Td
(2357 #define T_OFLOW          4      // overflow) 209.6887 Tj
0 -104.427 Td
(2358 #define T_BOUND          5      // bounds check) 227.1628 Tj
0 -113.9203 Td
(2359 #define T_ILLOP          6      // illegal opcode) 235.8998 Tj
0 -123.4137 Td
(2360 #define T_DEVICE         7      // device not available) 262.1109 Tj
0 -132.9071 Td
(2361 #define T_DBLFLT         8      // double fault) 227.1628 Tj
0 -142.4004 Td
(2362 // #define T_COPROC      9      // reserved \(not used sin\
ce 486\)) 301.4275 Tj
0 -151.8938 Td
(2363 #define T_TSS           10      // invalid task switch seg\
ment) 292.6905 Tj
0 -161.3871 Td
(2364 #define T_SEGNP         11      // segment not present) 257.7424 Tj
0 -170.8805 Td
(2365 #define T_STACK         12      // stack exception) 240.2683 Tj
0 -180.3739 Td
(2366 #define T_GPFLT         13      // general protection faul\
t) 279.5849 Tj
0 -189.8672 Td
(2367 #define T_PGFLT         14      // page fault) 218.4257 Tj
0 -199.3606 Td
(2368 // #define T_RES        15      // reserved) 209.6887 Tj
0 -208.8539 Td
(2369 #define T_FPERR         16      // floating point error) 262.1109 Tj
0 -218.3473 Td
(2370 #define T_ALIGN         17      // aligment check) 235.8998 Tj
0 -227.8407 Td
(2371 #define T_MCHK          18      // machine check) 231.5313 Tj
0 -237.334 Td
(2372 #define T_SIMDERR       19      // SIMD floating point err\
or) 283.9534 Tj
0 -246.8274 Td
(2373 ) 21.8426 Tj
0 -256.3207 Td
(2374 // These are arbitrarily chosen, but with care not to over\
lap) 288.322 Tj
0 -265.8141 Td
(2375 // processor defined exceptions or interrupt vectors.) 253.3738 Tj
0 -275.3075 Td
(2376 #define T_SYSCALL       48      // system call) 222.7942 Tj
0 -284.8008 Td
(2377 #define T_DEFAULT      500      // catchall) 209.6887 Tj
0 -294.2942 Td
(2378 ) 21.8426 Tj
0 -303.7875 Td
(2379 #define IRQ_OFFSET      32      // IRQ 0 corresponds to in\
t IRQ_OFFSET) 327.6386 Tj
0 -313.2809 Td
(2380 ) 21.8426 Tj
0 -322.7743 Td
(2381 #define IRQ_TIMER        0) 135.4239 Tj
0 -332.2676 Td
(2382 #define IRQ_KBD          1) 135.4239 Tj
0 -341.761 Td
(2383 #define IRQ_IDE         14) 135.4239 Tj
0 -351.2543 Td
(2384 #define IRQ_ERROR       19) 135.4239 Tj
0 -360.7477 Td
(2385 #define IRQ_SPURIOUS    31) 135.4239 Tj
0 -370.2411 Td
(2386 ) 21.8426 Tj
0 -379.7344 Td
(2387 ) 21.8426 Tj
0 -389.2278 Td
(2388 ) 21.8426 Tj
0 -398.7211 Td
(2389 ) 21.8426 Tj
0 -408.2145 Td
(2390 ) 21.8426 Tj
0 -417.7079 Td
(2391 ) 21.8426 Tj
0 -427.2012 Td
(2392 ) 21.8426 Tj
0 -436.6946 Td
(2393 ) 21.8426 Tj
0 -446.1879 Td
(2394 ) 21.8426 Tj
0 -455.6813 Td
(2395 ) 21.8426 Tj
0 -465.1747 Td
(2396 ) 21.8426 Tj
0 -474.668 Td
(2397 ) 21.8426 Tj
0 -484.1614 Td
(2398 ) 21.8426 Tj
0 -493.6547 Td
(2399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 23) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 31 31
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/vectors.pl  Page 1) 179.1091 Tj
0 -28.4801 Td
(2400 #!/usr/bin/perl -w) 100.4758 Tj
0 -37.9735 Td
(2401 ) 21.8426 Tj
0 -47.4668 Td
(2402 # Generate vectors.S, the trap/interrupt entry points.) 257.7424 Tj
0 -56.9602 Td
(2403 # There has to be one entry point per interrupt number) 257.7424 Tj
0 -66.4535 Td
(2404 # since otherwise there's no way for trap\(\) to discover) 262.1109 Tj
0 -75.9469 Td
(2405 # the interrupt number.) 122.3184 Tj
0 -85.4403 Td
(2406 ) 21.8426 Tj
0 -94.9336 Td
(2407 print "# generated by vectors.pl - do not edit\\n";) 240.2683 Tj
0 -104.427 Td
(2408 print "# handlers\\n";) 113.5814 Tj
0 -113.9203 Td
(2409 print ".text\\n";) 91.7388 Tj
0 -123.4137 Td
(2410 print ".globl alltraps\\n";) 135.4239 Tj
0 -132.9071 Td
(2411 for\(my $i = 0; $i < 256; $i++\){) 157.2665 Tj
0 -142.4004 Td
(2412     print ".globl vector$i\\n";) 152.898 Tj
0 -151.8938 Td
(2413     print "vector$i:\\n";) 126.6869 Tj
0 -161.3871 Td
(2414     if\(\($i < 8 || $i > 14\) && $i != 17\){) 196.5831 Tj
0 -170.8805 Td
(2415         print "  pushl \\$0\\n";) 152.898 Tj
0 -180.3739 Td
(2416     }) 43.6851 Tj
0 -189.8672 Td
(2417     print "  pushl \\$$i\\n";) 139.7925 Tj
0 -199.3606 Td
(2418     print "  jmp alltraps\\n";) 148.5295 Tj
0 -208.8539 Td
(2419 }) 26.2111 Tj
0 -218.3473 Td
(2420 ) 21.8426 Tj
0 -227.8407 Td
(2421 print "\\n# vector table\\n";) 139.7925 Tj
0 -237.334 Td
(2422 print ".data\\n";) 91.7388 Tj
0 -246.8274 Td
(2423 print ".globl vectors\\n";) 131.0554 Tj
0 -256.3207 Td
(2424 print "vectors:\\n";) 104.8443 Tj
0 -265.8141 Td
(2425 for\(my $i = 0; $i < 256; $i++\){) 157.2665 Tj
0 -275.3075 Td
(2426     print "  .long vector$i\\n";) 157.2665 Tj
0 -284.8008 Td
(2427 }) 26.2111 Tj
0 -294.2942 Td
(2428 ) 21.8426 Tj
0 -303.7875 Td
(2429 # sample output:) 91.7388 Tj
0 -313.2809 Td
(2430 #   # handlers) 83.0018 Tj
0 -322.7743 Td
(2431 #   .text) 61.1592 Tj
0 -332.2676 Td
(2432 #   .globl alltraps) 104.8443 Tj
0 -341.761 Td
(2433 #   .globl vector0) 100.4758 Tj
0 -351.2543 Td
(2434 #   vector0:) 74.2647 Tj
0 -360.7477 Td
(2435 #     pushl $0) 83.0018 Tj
0 -370.2411 Td
(2436 #     pushl $0) 83.0018 Tj
0 -379.7344 Td
(2437 #     jmp alltraps) 100.4758 Tj
0 -389.2278 Td
(2438 #   ...) 52.4222 Tj
0 -398.7211 Td
(2439 #) 26.2111 Tj
0 -408.2145 Td
(2440 #   # vector table) 100.4758 Tj
0 -417.7079 Td
(2441 #   .data) 61.1592 Tj
0 -427.2012 Td
(2442 #   .globl vectors) 100.4758 Tj
0 -436.6946 Td
(2443 #   vectors:) 74.2647 Tj
0 -446.1879 Td
(2444 #     .long vector0) 104.8443 Tj
0 -455.6813 Td
(2445 #     .long vector1) 104.8443 Tj
0 -465.1747 Td
(2446 #     .long vector2) 104.8443 Tj
0 -474.668 Td
(2447 #   ...) 52.4222 Tj
0 -484.1614 Td
(2448 ) 21.8426 Tj
0 -493.6547 Td
(2449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 24) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/trapasm.S  Page 1) 174.7406 Tj
0 -28.4801 Td
(2450 .text) 43.6851 Tj
0 -37.9735 Td
(2451 ) 21.8426 Tj
0 -47.4668 Td
(2452 .set SEG_KDATA_SEL, 0x10   # selector for SEG_KDATA) 244.6368 Tj
0 -56.9602 Td
(2453 ) 21.8426 Tj
0 -66.4535 Td
(2454   # vectors.S sends all traps here.) 174.7406 Tj
0 -75.9469 Td
(2455 .globl alltraps) 87.3703 Tj
0 -85.4403 Td
(2456 alltraps:) 61.1592 Tj
0 -94.9336 Td
(2457   # Build trap frame.) 113.5814 Tj
0 -104.427 Td
(2458   pushl %ds) 69.8962 Tj
0 -113.9203 Td
(2459   pushl %es) 69.8962 Tj
0 -123.4137 Td
(2460   pushal) 56.7907 Tj
0 -132.9071 Td
(2461 ) 21.8426 Tj
0 -142.4004 Td
(2462   # Set up data segments.) 131.0554 Tj
0 -151.8938 Td
(2463   movl $SEG_KDATA_SEL, %eax) 139.7925 Tj
0 -161.3871 Td
(2464   movw %ax,%ds) 83.0018 Tj
0 -170.8805 Td
(2465   movw %ax,%es) 83.0018 Tj
0 -180.3739 Td
(2466 ) 21.8426 Tj
0 -189.8672 Td
(2467   # Call trap\(tf\), where tf=%esp) 161.635 Tj
0 -199.3606 Td
(2468   pushl %esp) 74.2647 Tj
0 -208.8539 Td
(2469   call trap) 69.8962 Tj
0 -218.3473 Td
(2470   addl $4, %esp) 87.3703 Tj
0 -227.8407 Td
(2471 ) 21.8426 Tj
0 -237.334 Td
(2472   # Return falls through to trapret...) 187.8461 Tj
0 -246.8274 Td
(2473 .globl trapret) 83.0018 Tj
0 -256.3207 Td
(2474 trapret:) 56.7907 Tj
0 -265.8141 Td
(2475   popal) 52.4222 Tj
0 -275.3075 Td
(2476   popl %es) 65.5277 Tj
0 -284.8008 Td
(2477   popl %ds) 65.5277 Tj
0 -294.2942 Td
(2478   addl $0x8, %esp  # trapno and errcode) 192.2146 Tj
0 -303.7875 Td
(2479   iret) 48.0537 Tj
0 -313.2809 Td
(2480 ) 21.8426 Tj
0 -322.7743 Td
(2481   # A forked process switches to user mode by calling) 253.3738 Tj
0 -332.2676 Td
(2482   # forkret1\(tf\), where tf is the trap frame to use.) 249.0053 Tj
0 -341.761 Td
(2483 .globl forkret1) 87.3703 Tj
0 -351.2543 Td
(2484 forkret1:) 61.1592 Tj
0 -360.7477 Td
(2485   movl 4\(%esp\), %esp) 109.2129 Tj
0 -370.2411 Td
(2486   jmp trapret) 78.6333 Tj
0 -379.7344 Td
(2487 ) 21.8426 Tj
0 -389.2278 Td
(2488 ) 21.8426 Tj
0 -398.7211 Td
(2489 ) 21.8426 Tj
0 -408.2145 Td
(2490 ) 21.8426 Tj
0 -417.7079 Td
(2491 ) 21.8426 Tj
0 -427.2012 Td
(2492 ) 21.8426 Tj
0 -436.6946 Td
(2493 ) 21.8426 Tj
0 -446.1879 Td
(2494 ) 21.8426 Tj
0 -455.6813 Td
(2495 ) 21.8426 Tj
0 -465.1747 Td
(2496 ) 21.8426 Tj
0 -474.668 Td
(2497 ) 21.8426 Tj
0 -484.1614 Td
(2498 ) 21.8426 Tj
0 -493.6547 Td
(2499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 24) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 32 32
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/trap.c  Page 1) 161.635 Tj
0 -28.4801 Td
(2500 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(2501 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(2502 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(2503 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(2504 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(2505 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(2506 #include "traps.h") 100.4758 Tj
0 -94.9336 Td
(2507 #include "spinlock.h") 113.5814 Tj
0 -104.427 Td
(2508 ) 21.8426 Tj
0 -113.9203 Td
(2509 // Interrupt descriptor table \(shared by all CPUs\).) 244.6368 Tj
0 -123.4137 Td
(2510 struct gatedesc idt[256];) 131.0554 Tj
0 -132.9071 Td
(2511 extern uint vectors[];  // in vectors.S: array of 256 entr\
y pointers) 318.9016 Tj
0 -142.4004 Td
(2512 struct spinlock tickslock;) 135.4239 Tj
0 -151.8938 Td
(2513 int ticks;) 65.5277 Tj
0 -161.3871 Td
(2514 ) 21.8426 Tj
0 -170.8805 Td
(2515 void) 39.3166 Tj
0 -180.3739 Td
(2516 tvinit\(void\)) 74.2647 Tj
0 -189.8672 Td
(2517 {) 26.2111 Tj
0 -199.3606 Td
(2518   int i;) 56.7907 Tj
0 -208.8539 Td
(2519 ) 21.8426 Tj
0 -218.3473 Td
(2520   for\(i = 0; i < 256; i++\)) 135.4239 Tj
0 -227.8407 Td
(2521     SETGATE\(idt[i], 0, SEG_KCODE<<3, vectors[i], 0\);) 249.0053 Tj
0 -237.334 Td
(2522   SETGATE\(idt[T_SYSCALL], 1, SEG_KCODE<<3, vectors[T_SYSC\
ALL], DPL_USER\);) 340.7441 Tj
0 -246.8274 Td
(2523 ) 21.8426 Tj
0 -256.3207 Td
(2524   initlock\(&tickslock, "time"\);) 157.2665 Tj
0 -265.8141 Td
(2525 }) 26.2111 Tj
0 -275.3075 Td
(2526 ) 21.8426 Tj
0 -284.8008 Td
(2527 void) 39.3166 Tj
0 -294.2942 Td
(2528 idtinit\(void\)) 78.6333 Tj
0 -303.7875 Td
(2529 {) 26.2111 Tj
0 -313.2809 Td
(2530   lidt\(idt, sizeof\(idt\)\);) 131.0554 Tj
0 -322.7743 Td
(2531 }) 26.2111 Tj
0 -332.2676 Td
(2532 ) 21.8426 Tj
0 -341.761 Td
(2533 void) 39.3166 Tj
0 -351.2543 Td
(2534 trap\(struct trapframe *tf\)) 135.4239 Tj
0 -360.7477 Td
(2535 {) 26.2111 Tj
0 -370.2411 Td
(2536   if\(tf->trapno == T_SYSCALL\){) 152.898 Tj
0 -379.7344 Td
(2537     if\(cp->killed\)) 100.4758 Tj
0 -389.2278 Td
(2538       exit\(\);) 78.6333 Tj
0 -398.7211 Td
(2539     cp->tf = tf;) 91.7388 Tj
0 -408.2145 Td
(2540     syscall\(\);) 83.0018 Tj
0 -417.7079 Td
(2541     if\(cp->killed\)) 100.4758 Tj
0 -427.2012 Td
(2542       exit\(\);) 78.6333 Tj
0 -436.6946 Td
(2543     return;) 69.8962 Tj
0 -446.1879 Td
(2544   }) 34.9481 Tj
0 -455.6813 Td
(2545 ) 21.8426 Tj
0 -465.1747 Td
(2546   switch\(tf->trapno\){) 113.5814 Tj
0 -474.668 Td
(2547   case IRQ_OFFSET + IRQ_TIMER:) 152.898 Tj
0 -484.1614 Td
(2548     if\(cpu\(\) == 0\){) 104.8443 Tj
0 -493.6547 Td
(2549       acquire\(&tickslock\);) 135.4239 Tj
0 -522.1348 Td
(Sheet 25) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/trap.c  Page 2) 161.635 Tj
0 -28.4801 Td
(2550       ticks++;) 83.0018 Tj
0 -37.9735 Td
(2551       wakeup\(&ticks\);) 113.5814 Tj
0 -47.4668 Td
(2552       release\(&tickslock\);) 135.4239 Tj
0 -56.9602 Td
(2553     }) 43.6851 Tj
0 -66.4535 Td
(2554     lapic_eoi\(\);) 91.7388 Tj
0 -75.9469 Td
(2555     break;) 65.5277 Tj
0 -85.4403 Td
(2556   case IRQ_OFFSET + IRQ_IDE:) 144.161 Tj
0 -94.9336 Td
(2557     ide_intr\(\);) 87.3703 Tj
0 -104.427 Td
(2558     lapic_eoi\(\);) 91.7388 Tj
0 -113.9203 Td
(2559     break;) 65.5277 Tj
0 -123.4137 Td
(2560   case IRQ_OFFSET + IRQ_KBD:) 144.161 Tj
0 -132.9071 Td
(2561     kbd_intr\(\);) 87.3703 Tj
0 -142.4004 Td
(2562     lapic_eoi\(\);) 91.7388 Tj
0 -151.8938 Td
(2563     break;) 65.5277 Tj
0 -161.3871 Td
(2564   case IRQ_OFFSET + IRQ_SPURIOUS:) 166.0035 Tj
0 -170.8805 Td
(2565     cprintf\("cpu%d: spurious interrupt at %x:%x\\n",) 244.6368 Tj
0 -180.3739 Td
(2566             cpu\(\), tf->cs, tf->eip\);) 179.1091 Tj
0 -189.8672 Td
(2567     lapic_eoi\(\);) 91.7388 Tj
0 -199.3606 Td
(2568     break;) 65.5277 Tj
0 -208.8539 Td
(2569 ) 21.8426 Tj
0 -218.3473 Td
(2570   default:) 65.5277 Tj
0 -227.8407 Td
(2571     if\(cp == 0 || \(tf->cs&3\) == 0\){) 174.7406 Tj
0 -237.334 Td
(2572       // In kernel, it must be our mistake.) 209.6887 Tj
0 -246.8274 Td
(2573       cprintf\("unexpected trap %d from cpu %d eip %x\\n",) 266.4794 Tj
0 -256.3207 Td
(2574               tf->trapno, cpu\(\), tf->eip\);) 205.3202 Tj
0 -265.8141 Td
(2575       panic\("trap"\);) 109.2129 Tj
0 -275.3075 Td
(2576     }) 43.6851 Tj
0 -284.8008 Td
(2577     // In user space, assume process misbehaved.) 231.5313 Tj
0 -294.2942 Td
(2578     cprintf\("pid %d %s: trap %d err %d on cpu %d eip %x -\
- kill proc\\n",) 336.3756 Tj
0 -303.7875 Td
(2579             cp->pid, cp->name, tf->trapno, tf->err, cpu\(\)\
, tf->eip\);) 318.9016 Tj
0 -313.2809 Td
(2580     cp->killed = 1;) 104.8443 Tj
0 -322.7743 Td
(2581   }) 34.9481 Tj
0 -332.2676 Td
(2582 ) 21.8426 Tj
0 -341.761 Td
(2583   // Force process exit if it has been killed and is in us\
er space.) 314.533 Tj
0 -351.2543 Td
(2584   // \(If it is still executing in the kernel, let it keep\
 running) 305.796 Tj
0 -360.7477 Td
(2585   // until it gets to the regular system call return.\)) 257.7424 Tj
0 -370.2411 Td
(2586   if\(cp && cp->killed && \(tf->cs&3\) == DPL_USER\)) 231.5313 Tj
0 -379.7344 Td
(2587     exit\(\);) 69.8962 Tj
0 -389.2278 Td
(2588 ) 21.8426 Tj
0 -398.7211 Td
(2589   // Force process to give up CPU on clock tick.) 231.5313 Tj
0 -408.2145 Td
(2590   // If interrupts were on while locks held, would need to\
 check nlock.) 332.0071 Tj
0 -417.7079 Td
(2591   if\(cp && cp->state == RUNNING && tf->trapno == IRQ_OFFS\
ET+IRQ_TIMER\)) 327.6386 Tj
0 -427.2012 Td
(2592     yield\(\);) 74.2647 Tj
0 -436.6946 Td
(2593 }) 26.2111 Tj
0 -446.1879 Td
(2594 ) 21.8426 Tj
0 -455.6813 Td
(2595 ) 21.8426 Tj
0 -465.1747 Td
(2596 ) 21.8426 Tj
0 -474.668 Td
(2597 ) 21.8426 Tj
0 -484.1614 Td
(2598 ) 21.8426 Tj
0 -493.6547 Td
(2599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 25) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 33 33
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/syscall.h  Page 1) 174.7406 Tj
0 -28.4801 Td
(2600 // System call numbers) 117.9499 Tj
0 -37.9735 Td
(2601 #define SYS_fork    1) 113.5814 Tj
0 -47.4668 Td
(2602 #define SYS_exit    2) 113.5814 Tj
0 -56.9602 Td
(2603 #define SYS_wait    3) 113.5814 Tj
0 -66.4535 Td
(2604 #define SYS_pipe    4) 113.5814 Tj
0 -75.9469 Td
(2605 #define SYS_write   5) 113.5814 Tj
0 -85.4403 Td
(2606 #define SYS_read    6) 113.5814 Tj
0 -94.9336 Td
(2607 #define SYS_close   7) 113.5814 Tj
0 -104.427 Td
(2608 #define SYS_kill    8) 113.5814 Tj
0 -113.9203 Td
(2609 #define SYS_exec    9) 113.5814 Tj
0 -123.4137 Td
(2610 #define SYS_open   10) 113.5814 Tj
0 -132.9071 Td
(2611 #define SYS_mknod  11) 113.5814 Tj
0 -142.4004 Td
(2612 #define SYS_unlink 12) 113.5814 Tj
0 -151.8938 Td
(2613 #define SYS_fstat  13) 113.5814 Tj
0 -161.3871 Td
(2614 #define SYS_link   14) 113.5814 Tj
0 -170.8805 Td
(2615 #define SYS_mkdir  15) 113.5814 Tj
0 -180.3739 Td
(2616 #define SYS_chdir  16) 113.5814 Tj
0 -189.8672 Td
(2617 #define SYS_dup    17) 113.5814 Tj
0 -199.3606 Td
(2618 #define SYS_getpid 18) 113.5814 Tj
0 -208.8539 Td
(2619 #define SYS_sbrk   19) 113.5814 Tj
0 -218.3473 Td
(2620 #define SYS_sleep  20) 113.5814 Tj
0 -227.8407 Td
(2621 ) 21.8426 Tj
0 -237.334 Td
(2622 ) 21.8426 Tj
0 -246.8274 Td
(2623 ) 21.8426 Tj
0 -256.3207 Td
(2624 ) 21.8426 Tj
0 -265.8141 Td
(2625 ) 21.8426 Tj
0 -275.3075 Td
(2626 ) 21.8426 Tj
0 -284.8008 Td
(2627 ) 21.8426 Tj
0 -294.2942 Td
(2628 ) 21.8426 Tj
0 -303.7875 Td
(2629 ) 21.8426 Tj
0 -313.2809 Td
(2630 ) 21.8426 Tj
0 -322.7743 Td
(2631 ) 21.8426 Tj
0 -332.2676 Td
(2632 ) 21.8426 Tj
0 -341.761 Td
(2633 ) 21.8426 Tj
0 -351.2543 Td
(2634 ) 21.8426 Tj
0 -360.7477 Td
(2635 ) 21.8426 Tj
0 -370.2411 Td
(2636 ) 21.8426 Tj
0 -379.7344 Td
(2637 ) 21.8426 Tj
0 -389.2278 Td
(2638 ) 21.8426 Tj
0 -398.7211 Td
(2639 ) 21.8426 Tj
0 -408.2145 Td
(2640 ) 21.8426 Tj
0 -417.7079 Td
(2641 ) 21.8426 Tj
0 -427.2012 Td
(2642 ) 21.8426 Tj
0 -436.6946 Td
(2643 ) 21.8426 Tj
0 -446.1879 Td
(2644 ) 21.8426 Tj
0 -455.6813 Td
(2645 ) 21.8426 Tj
0 -465.1747 Td
(2646 ) 21.8426 Tj
0 -474.668 Td
(2647 ) 21.8426 Tj
0 -484.1614 Td
(2648 ) 21.8426 Tj
0 -493.6547 Td
(2649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 26) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/syscall.c  Page 1) 174.7406 Tj
0 -28.4801 Td
(2650 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(2651 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(2652 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(2653 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(2654 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(2655 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(2656 #include "syscall.h") 109.2129 Tj
0 -94.9336 Td
(2657 ) 21.8426 Tj
0 -104.427 Td
(2658 // User code makes a system call with INT T_SYSCALL.) 249.0053 Tj
0 -113.9203 Td
(2659 // System call number in %eax.) 152.898 Tj
0 -123.4137 Td
(2660 // Arguments on the stack, from the user call to the C) 257.7424 Tj
0 -132.9071 Td
(2661 // library system call function. The saved user %esp point\
s) 279.5849 Tj
0 -142.4004 Td
(2662 // to a saved program counter, and then the first argument\
.) 279.5849 Tj
0 -151.8938 Td
(2663 ) 21.8426 Tj
0 -161.3871 Td
(2664 // Fetch the int at addr from process p.) 196.5831 Tj
0 -170.8805 Td
(2665 int) 34.9481 Tj
0 -180.3739 Td
(2666 fetchint\(struct proc *p, uint addr, int *ip\)) 214.0572 Tj
0 -189.8672 Td
(2667 {) 26.2111 Tj
0 -199.3606 Td
(2668   if\(addr >= p->sz || addr+4 > p->sz\)) 183.4776 Tj
0 -208.8539 Td
(2669     return -1;) 83.0018 Tj
0 -218.3473 Td
(2670   *ip = *\(int*\)\(p->mem + addr\);) 157.2665 Tj
0 -227.8407 Td
(2671   return 0;) 69.8962 Tj
0 -237.334 Td
(2672 }) 26.2111 Tj
0 -246.8274 Td
(2673 ) 21.8426 Tj
0 -256.3207 Td
(2674 // Fetch the nul-terminated string at addr from process p.) 275.2164 Tj
0 -265.8141 Td
(2675 // Doesn't actually copy the string - just sets *pp to poi\
nt at it.) 314.533 Tj
0 -275.3075 Td
(2676 // Returns length of string, not including nul.) 227.1628 Tj
0 -284.8008 Td
(2677 int) 34.9481 Tj
0 -294.2942 Td
(2678 fetchstr\(struct proc *p, uint addr, char **pp\)) 222.7942 Tj
0 -303.7875 Td
(2679 {) 26.2111 Tj
0 -313.2809 Td
(2680   char *s, *ep;) 87.3703 Tj
0 -322.7743 Td
(2681 ) 21.8426 Tj
0 -332.2676 Td
(2682   if\(addr >= p->sz\)) 104.8443 Tj
0 -341.761 Td
(2683     return -1;) 83.0018 Tj
0 -351.2543 Td
(2684   *pp = p->mem + addr;) 117.9499 Tj
0 -360.7477 Td
(2685   ep = p->mem + p->sz;) 117.9499 Tj
0 -370.2411 Td
(2686   for\(s = *pp; s < ep; s++\)) 139.7925 Tj
0 -379.7344 Td
(2687     if\(*s == 0\)) 87.3703 Tj
0 -389.2278 Td
(2688       return s - *pp;) 113.5814 Tj
0 -398.7211 Td
(2689   return -1;) 74.2647 Tj
0 -408.2145 Td
(2690 }) 26.2111 Tj
0 -417.7079 Td
(2691 ) 21.8426 Tj
0 -427.2012 Td
(2692 // Fetch the nth 32-bit system call argument.) 218.4257 Tj
0 -436.6946 Td
(2693 int) 34.9481 Tj
0 -446.1879 Td
(2694 argint\(int n, int *ip\)) 117.9499 Tj
0 -455.6813 Td
(2695 {) 26.2111 Tj
0 -465.1747 Td
(2696   return fetchint\(cp, cp->tf->esp + 4 + 4*n, ip\);) 235.8998 Tj
0 -474.668 Td
(2697 }) 26.2111 Tj
0 -484.1614 Td
(2698 ) 21.8426 Tj
0 -493.6547 Td
(2699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 26) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 34 34
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/syscall.c  Page 2) 174.7406 Tj
0 -28.4801 Td
(2700 // Fetch the nth word-sized system call argument as a poin\
ter) 288.322 Tj
0 -37.9735 Td
(2701 // to a block of memory of size n bytes.  Check that the p\
ointer) 301.4275 Tj
0 -47.4668 Td
(2702 // lies within the process address space.) 200.9517 Tj
0 -56.9602 Td
(2703 int) 34.9481 Tj
0 -66.4535 Td
(2704 argptr\(int n, char **pp, int size\)) 170.3721 Tj
0 -75.9469 Td
(2705 {) 26.2111 Tj
0 -85.4403 Td
(2706   int i;) 56.7907 Tj
0 -94.9336 Td
(2707 ) 21.8426 Tj
0 -104.427 Td
(2708   if\(argint\(n, &i\) < 0\)) 122.3184 Tj
0 -113.9203 Td
(2709     return -1;) 83.0018 Tj
0 -123.4137 Td
(2710   if\(\(uint\)i >= cp->sz || \(uint\)i+size >= cp->sz\)) 235.8998 Tj
0 -132.9071 Td
(2711     return -1;) 83.0018 Tj
0 -142.4004 Td
(2712   *pp = cp->mem + i;) 109.2129 Tj
0 -151.8938 Td
(2713   return 0;) 69.8962 Tj
0 -161.3871 Td
(2714 }) 26.2111 Tj
0 -170.8805 Td
(2715 ) 21.8426 Tj
0 -180.3739 Td
(2716 // Fetch the nth word-sized system call argument as a stri\
ng pointer.) 323.2701 Tj
0 -189.8672 Td
(2717 // Check that the pointer is valid and the string is nul-t\
erminated.) 318.9016 Tj
0 -199.3606 Td
(2718 // \(There is no shared writable memory, so the string can\
't change) 310.1645 Tj
0 -208.8539 Td
(2719 // between this check and being used by the kernel.\)) 249.0053 Tj
0 -218.3473 Td
(2720 int) 34.9481 Tj
0 -227.8407 Td
(2721 argstr\(int n, char **pp\)) 126.6869 Tj
0 -237.334 Td
(2722 {) 26.2111 Tj
0 -246.8274 Td
(2723   int addr;) 69.8962 Tj
0 -256.3207 Td
(2724   if\(argint\(n, &addr\) < 0\)) 135.4239 Tj
0 -265.8141 Td
(2725     return -1;) 83.0018 Tj
0 -275.3075 Td
(2726   return fetchstr\(cp, addr, pp\);) 161.635 Tj
0 -284.8008 Td
(2727 }) 26.2111 Tj
0 -294.2942 Td
(2728 ) 21.8426 Tj
0 -303.7875 Td
(2729 extern int sys_chdir\(void\);) 139.7925 Tj
0 -313.2809 Td
(2730 extern int sys_close\(void\);) 139.7925 Tj
0 -322.7743 Td
(2731 extern int sys_dup\(void\);) 131.0554 Tj
0 -332.2676 Td
(2732 extern int sys_exec\(void\);) 135.4239 Tj
0 -341.761 Td
(2733 extern int sys_exit\(void\);) 135.4239 Tj
0 -351.2543 Td
(2734 extern int sys_fork\(void\);) 135.4239 Tj
0 -360.7477 Td
(2735 extern int sys_fstat\(void\);) 139.7925 Tj
0 -370.2411 Td
(2736 extern int sys_getpid\(void\);) 144.161 Tj
0 -379.7344 Td
(2737 extern int sys_kill\(void\);) 135.4239 Tj
0 -389.2278 Td
(2738 extern int sys_link\(void\);) 135.4239 Tj
0 -398.7211 Td
(2739 extern int sys_mkdir\(void\);) 139.7925 Tj
0 -408.2145 Td
(2740 extern int sys_mknod\(void\);) 139.7925 Tj
0 -417.7079 Td
(2741 extern int sys_open\(void\);) 135.4239 Tj
0 -427.2012 Td
(2742 extern int sys_pipe\(void\);) 135.4239 Tj
0 -436.6946 Td
(2743 extern int sys_read\(void\);) 135.4239 Tj
0 -446.1879 Td
(2744 extern int sys_sbrk\(void\);) 135.4239 Tj
0 -455.6813 Td
(2745 extern int sys_sleep\(void\);) 139.7925 Tj
0 -465.1747 Td
(2746 extern int sys_unlink\(void\);) 144.161 Tj
0 -474.668 Td
(2747 extern int sys_wait\(void\);) 135.4239 Tj
0 -484.1614 Td
(2748 extern int sys_write\(void\);) 139.7925 Tj
0 -493.6547 Td
(2749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 27) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/syscall.c  Page 3) 174.7406 Tj
0 -28.4801 Td
(2750 static int \(*syscalls[]\)\(void\) = {) 170.3721 Tj
0 -37.9735 Td
(2751 [SYS_chdir]   sys_chdir,) 126.6869 Tj
0 -47.4668 Td
(2752 [SYS_close]   sys_close,) 126.6869 Tj
0 -56.9602 Td
(2753 [SYS_dup]     sys_dup,) 117.9499 Tj
0 -66.4535 Td
(2754 [SYS_exec]    sys_exec,) 122.3184 Tj
0 -75.9469 Td
(2755 [SYS_exit]    sys_exit,) 122.3184 Tj
0 -85.4403 Td
(2756 [SYS_fork]    sys_fork,) 122.3184 Tj
0 -94.9336 Td
(2757 [SYS_fstat]   sys_fstat,) 126.6869 Tj
0 -104.427 Td
(2758 [SYS_getpid]  sys_getpid,) 131.0554 Tj
0 -113.9203 Td
(2759 [SYS_kill]    sys_kill,) 122.3184 Tj
0 -123.4137 Td
(2760 [SYS_link]    sys_link,) 122.3184 Tj
0 -132.9071 Td
(2761 [SYS_mkdir]   sys_mkdir,) 126.6869 Tj
0 -142.4004 Td
(2762 [SYS_mknod]   sys_mknod,) 126.6869 Tj
0 -151.8938 Td
(2763 [SYS_open]    sys_open,) 122.3184 Tj
0 -161.3871 Td
(2764 [SYS_pipe]    sys_pipe,) 122.3184 Tj
0 -170.8805 Td
(2765 [SYS_read]    sys_read,) 122.3184 Tj
0 -180.3739 Td
(2766 [SYS_sbrk]    sys_sbrk,) 122.3184 Tj
0 -189.8672 Td
(2767 [SYS_sleep]   sys_sleep,) 126.6869 Tj
0 -199.3606 Td
(2768 [SYS_unlink]  sys_unlink,) 131.0554 Tj
0 -208.8539 Td
(2769 [SYS_wait]    sys_wait,) 122.3184 Tj
0 -218.3473 Td
(2770 [SYS_write]   sys_write,) 126.6869 Tj
0 -227.8407 Td
(2771 };) 30.5796 Tj
0 -237.334 Td
(2772 ) 21.8426 Tj
0 -246.8274 Td
(2773 void) 39.3166 Tj
0 -256.3207 Td
(2774 syscall\(void\)) 78.6333 Tj
0 -265.8141 Td
(2775 {) 26.2111 Tj
0 -275.3075 Td
(2776   int num;) 65.5277 Tj
0 -284.8008 Td
(2777 ) 21.8426 Tj
0 -294.2942 Td
(2778   num = cp->tf->eax;) 109.2129 Tj
0 -303.7875 Td
(2779   if\(num >= 0 && num < NELEM\(syscalls\) && syscalls[num]\
\)) 266.4794 Tj
0 -313.2809 Td
(2780     cp->tf->eax = syscalls[num]\(\);) 170.3721 Tj
0 -322.7743 Td
(2781   else {) 56.7907 Tj
0 -332.2676 Td
(2782     cprintf\("%d %s: unknown sys call %d\\n",) 209.6887 Tj
0 -341.761 Td
(2783             cp->pid, cp->name, num\);) 179.1091 Tj
0 -351.2543 Td
(2784     cp->tf->eax = -1;) 113.5814 Tj
0 -360.7477 Td
(2785   }) 34.9481 Tj
0 -370.2411 Td
(2786 }) 26.2111 Tj
0 -379.7344 Td
(2787 ) 21.8426 Tj
0 -389.2278 Td
(2788 ) 21.8426 Tj
0 -398.7211 Td
(2789 ) 21.8426 Tj
0 -408.2145 Td
(2790 ) 21.8426 Tj
0 -417.7079 Td
(2791 ) 21.8426 Tj
0 -427.2012 Td
(2792 ) 21.8426 Tj
0 -436.6946 Td
(2793 ) 21.8426 Tj
0 -446.1879 Td
(2794 ) 21.8426 Tj
0 -455.6813 Td
(2795 ) 21.8426 Tj
0 -465.1747 Td
(2796 ) 21.8426 Tj
0 -474.668 Td
(2797 ) 21.8426 Tj
0 -484.1614 Td
(2798 ) 21.8426 Tj
0 -493.6547 Td
(2799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 27) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 35 35
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysproc.c  Page 1) 174.7406 Tj
0 -28.4801 Td
(2800 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(2801 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(2802 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(2803 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(2804 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(2805 ) 21.8426 Tj
0 -85.4403 Td
(2806 int) 34.9481 Tj
0 -94.9336 Td
(2807 sys_fork\(void\)) 83.0018 Tj
0 -104.427 Td
(2808 {) 26.2111 Tj
0 -113.9203 Td
(2809   int pid;) 65.5277 Tj
0 -123.4137 Td
(2810   struct proc *np;) 100.4758 Tj
0 -132.9071 Td
(2811 ) 21.8426 Tj
0 -142.4004 Td
(2812   if\(\(np = copyproc\(cp\)\) == 0\)) 152.898 Tj
0 -151.8938 Td
(2813     return -1;) 83.0018 Tj
0 -161.3871 Td
(2814   pid = np->pid;) 91.7388 Tj
0 -170.8805 Td
(2815   np->state = RUNNABLE;) 122.3184 Tj
0 -180.3739 Td
(2816   return pid;) 78.6333 Tj
0 -189.8672 Td
(2817 }) 26.2111 Tj
0 -199.3606 Td
(2818 ) 21.8426 Tj
0 -208.8539 Td
(2819 int) 34.9481 Tj
0 -218.3473 Td
(2820 sys_exit\(void\)) 83.0018 Tj
0 -227.8407 Td
(2821 {) 26.2111 Tj
0 -237.334 Td
(2822   exit\(\);) 61.1592 Tj
0 -246.8274 Td
(2823   return 0;  // not reached) 139.7925 Tj
0 -256.3207 Td
(2824 }) 26.2111 Tj
0 -265.8141 Td
(2825 ) 21.8426 Tj
0 -275.3075 Td
(2826 int) 34.9481 Tj
0 -284.8008 Td
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(3107   uint off;) 69.8962 Tj
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(3108 };) 30.5796 Tj
0 -113.9203 Td
(3109 ) 21.8426 Tj
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(3110 ) 21.8426 Tj
0 -132.9071 Td
(3111 ) 21.8426 Tj
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(3112 ) 21.8426 Tj
0 -151.8938 Td
(3113 ) 21.8426 Tj
0 -161.3871 Td
(3114 ) 21.8426 Tj
0 -170.8805 Td
(3115 ) 21.8426 Tj
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(3116 ) 21.8426 Tj
0 -189.8672 Td
(3117 ) 21.8426 Tj
0 -199.3606 Td
(3118 ) 21.8426 Tj
0 -208.8539 Td
(3119 ) 21.8426 Tj
0 -218.3473 Td
(3120 ) 21.8426 Tj
0 -227.8407 Td
(3121 ) 21.8426 Tj
0 -237.334 Td
(3122 ) 21.8426 Tj
0 -246.8274 Td
(3123 ) 21.8426 Tj
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(3124 ) 21.8426 Tj
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(3125 ) 21.8426 Tj
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(3126 ) 21.8426 Tj
0 -284.8008 Td
(3127 ) 21.8426 Tj
0 -294.2942 Td
(3128 ) 21.8426 Tj
0 -303.7875 Td
(3129 ) 21.8426 Tj
0 -313.2809 Td
(3130 ) 21.8426 Tj
0 -322.7743 Td
(3131 ) 21.8426 Tj
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(3132 ) 21.8426 Tj
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(3133 ) 21.8426 Tj
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(3134 ) 21.8426 Tj
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(3135 ) 21.8426 Tj
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(3136 ) 21.8426 Tj
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(3137 ) 21.8426 Tj
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(3138 ) 21.8426 Tj
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(3139 ) 21.8426 Tj
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(3140 ) 21.8426 Tj
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(3141 ) 21.8426 Tj
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(3142 ) 21.8426 Tj
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(3147 ) 21.8426 Tj
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(3148 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/fs.h  Page 1) 152.898 Tj
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(3150 // On-disk file system format.) 152.898 Tj
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(3151 // Both the kernel and user programs use this header file.) 275.2164 Tj
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(3152 ) 21.8426 Tj
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(3153 // Block 0 is unused.) 113.5814 Tj
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(3154 // Block 1 is super block.) 135.4239 Tj
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(3155 // Inodes start at block 2.) 139.7925 Tj
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(3156 ) 21.8426 Tj
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(3157 #define BSIZE 512  // block size) 161.635 Tj
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(3158 ) 21.8426 Tj
0 -113.9203 Td
(3159 // File system super block) 135.4239 Tj
0 -123.4137 Td
(3160 struct superblock {) 104.8443 Tj
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(3161   uint size;         // Size of file system image \(blocks\
\)) 275.2164 Tj
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(3162   uint nblocks;      // Number of data blocks) 218.4257 Tj
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(3163   uint ninodes;      // Number of inodes.) 200.9517 Tj
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(3164 };) 30.5796 Tj
0 -170.8805 Td
(3165 ) 21.8426 Tj
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(3166 #define NADDRS \(NDIRECT+1\)) 135.4239 Tj
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(3167 #define NDIRECT 12) 100.4758 Tj
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(3168 #define INDIRECT 12) 104.8443 Tj
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(3169 #define NINDIRECT \(BSIZE / sizeof\(uint\)\)) 196.5831 Tj
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(3170 #define MAXFILE \(NDIRECT  + NINDIRECT\)) 187.8461 Tj
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(3171 ) 21.8426 Tj
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(3172 // On-disk inode structure) 135.4239 Tj
0 -246.8274 Td
(3173 struct dinode {) 87.3703 Tj
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(3174   short type;           // File type) 179.1091 Tj
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(3175   short major;          // Major device number \(T_DEV onl\
y\)) 279.5849 Tj
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(3176   short minor;          // Minor device number \(T_DEV onl\
y\)) 279.5849 Tj
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(3177   short nlink;          // Number of links to inode in fil\
e system) 310.1645 Tj
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(3178   uint size;            // Size of file \(bytes\)) 227.1628 Tj
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(3179   uint addrs[NADDRS];   // Data block addresses) 227.1628 Tj
0 -313.2809 Td
(3180 };) 30.5796 Tj
0 -322.7743 Td
(3181 ) 21.8426 Tj
0 -332.2676 Td
(3182 #define T_DIR  1   // Directory) 157.2665 Tj
0 -341.761 Td
(3183 #define T_FILE 2   // File) 135.4239 Tj
0 -351.2543 Td
(3184 #define T_DEV  3   // Special device) 179.1091 Tj
0 -360.7477 Td
(3185 ) 21.8426 Tj
0 -370.2411 Td
(3186 // Inodes per block.) 109.2129 Tj
0 -379.7344 Td
(3187 #define IPB           \(BSIZE / sizeof\(struct dinode\)\)) 253.3738 Tj
0 -389.2278 Td
(3188 ) 21.8426 Tj
0 -398.7211 Td
(3189 // Block containing inode i) 139.7925 Tj
0 -408.2145 Td
(3190 #define IBLOCK\(i\)     \(\(i\) / IPB + 2\)) 183.4776 Tj
0 -417.7079 Td
(3191 ) 21.8426 Tj
0 -427.2012 Td
(3192 // Bitmap bits per block) 126.6869 Tj
0 -436.6946 Td
(3193 #define BPB           \(BSIZE*8\)) 157.2665 Tj
0 -446.1879 Td
(3194 ) 21.8426 Tj
0 -455.6813 Td
(3195 // Block containing bit for block b) 174.7406 Tj
0 -465.1747 Td
(3196 #define BBLOCK\(b, ninodes\) \(b/BPB + \(ninodes\)/IPB + 3\
\)) 257.7424 Tj
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(3197 ) 21.8426 Tj
0 -484.1614 Td
(3198 ) 21.8426 Tj
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(3199 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/fs.h  Page 2) 152.898 Tj
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(3200 // Directory is a file containing a sequence of dirent str\
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(3201 #define DIRSIZ 14) 96.1073 Tj
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(3202 ) 21.8426 Tj
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(3204   ushort inum;) 83.0018 Tj
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(3205   char name[DIRSIZ];) 109.2129 Tj
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(3218 ) 21.8426 Tj
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(3221 ) 21.8426 Tj
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(3222 ) 21.8426 Tj
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(3223 ) 21.8426 Tj
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(3224 ) 21.8426 Tj
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(3225 ) 21.8426 Tj
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(3226 ) 21.8426 Tj
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(3227 ) 21.8426 Tj
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(3228 ) 21.8426 Tj
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(3229 ) 21.8426 Tj
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(3230 ) 21.8426 Tj
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(3231 ) 21.8426 Tj
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(3232 ) 21.8426 Tj
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(3233 ) 21.8426 Tj
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(3234 ) 21.8426 Tj
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(3235 ) 21.8426 Tj
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(3236 ) 21.8426 Tj
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(3237 ) 21.8426 Tj
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(3238 ) 21.8426 Tj
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(3239 ) 21.8426 Tj
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(3240 ) 21.8426 Tj
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(3241 ) 21.8426 Tj
0 -427.2012 Td
(3242 ) 21.8426 Tj
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(3243 ) 21.8426 Tj
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(3244 ) 21.8426 Tj
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(3245 ) 21.8426 Tj
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(3246 ) 21.8426 Tj
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(3247 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/fsvar.h  Page 1) 166.0035 Tj
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(3250 // in-core file system types) 144.161 Tj
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(3251 ) 21.8426 Tj
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(3252 struct inode {) 83.0018 Tj
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(3253   uint dev;           // Device number) 187.8461 Tj
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(3254   uint inum;          // Inode number) 183.4776 Tj
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(3255   int ref;            // Reference count) 196.5831 Tj
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(3256   int flags;          // I_BUSY, I_VALID) 196.5831 Tj
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(3257 ) 21.8426 Tj
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(3258   short type;         // copy of disk inode) 209.6887 Tj
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(3272 ) 21.8426 Tj
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(3273 ) 21.8426 Tj
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(3274 ) 21.8426 Tj
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(3275 ) 21.8426 Tj
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(3276 ) 21.8426 Tj
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(3277 ) 21.8426 Tj
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(3278 ) 21.8426 Tj
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(3279 ) 21.8426 Tj
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(3280 ) 21.8426 Tj
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(3300 // Simple PIO-based \(non-DMA\) IDE driver code.) 222.7942 Tj
0 -37.9735 Td
(3301 ) 21.8426 Tj
0 -47.4668 Td
(3302 #include "types.h") 100.4758 Tj
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(3303 #include "defs.h") 96.1073 Tj
0 -66.4535 Td
(3304 #include "param.h") 100.4758 Tj
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(3305 #include "mmu.h") 91.7388 Tj
0 -85.4403 Td
(3306 #include "proc.h") 96.1073 Tj
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(3307 #include "x86.h") 91.7388 Tj
0 -104.427 Td
(3308 #include "traps.h") 100.4758 Tj
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(3309 #include "spinlock.h") 113.5814 Tj
0 -123.4137 Td
(3310 #include "buf.h") 91.7388 Tj
0 -132.9071 Td
(3311 ) 21.8426 Tj
0 -142.4004 Td
(3312 #define IDE_BSY       0x80) 135.4239 Tj
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(3313 #define IDE_DRDY      0x40) 135.4239 Tj
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(3314 #define IDE_DF        0x20) 135.4239 Tj
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(3315 #define IDE_ERR       0x01) 135.4239 Tj
0 -180.3739 Td
(3316 ) 21.8426 Tj
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(3317 #define IDE_CMD_READ  0x20) 135.4239 Tj
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(3318 #define IDE_CMD_WRITE 0x30) 135.4239 Tj
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(3319 ) 21.8426 Tj
0 -218.3473 Td
(3320 // ide_queue points to the buf now being read/written to t\
he disk.) 310.1645 Tj
0 -227.8407 Td
(3321 // ide_queue->qnext points to the next buf to be processed\
.) 279.5849 Tj
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(3322 // You must hold ide_lock while manipulating queue.) 244.6368 Tj
0 -246.8274 Td
(3323 ) 21.8426 Tj
0 -256.3207 Td
(3324 static struct spinlock ide_lock;) 161.635 Tj
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(3325 static struct buf *ide_queue;) 148.5295 Tj
0 -275.3075 Td
(3326 ) 21.8426 Tj
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(3327 static int disk_1_present;) 135.4239 Tj
0 -294.2942 Td
(3328 static void ide_start_request\(\);) 161.635 Tj
0 -303.7875 Td
(3329 ) 21.8426 Tj
0 -313.2809 Td
(3330 // Wait for IDE disk to become ready.) 183.4776 Tj
0 -322.7743 Td
(3331 static int) 65.5277 Tj
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(3333 {) 26.2111 Tj
0 -351.2543 Td
(3334   int r;) 56.7907 Tj
0 -360.7477 Td
(3335 ) 21.8426 Tj
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(3336   while\(\(\(r = inb\(0x1f7\)\) & IDE_BSY\) || !\(r & IDE_\
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0 -379.7344 Td
(3337     ;) 43.6851 Tj
0 -389.2278 Td
(3338   if\(check_error && \(r & \(IDE_DF|IDE_ERR\)\) != 0\)) 231.5313 Tj
0 -398.7211 Td
(3339     return -1;) 83.0018 Tj
0 -408.2145 Td
(3340   return 0;) 69.8962 Tj
0 -417.7079 Td
(3341 }) 26.2111 Tj
0 -427.2012 Td
(3342 ) 21.8426 Tj
0 -436.6946 Td
(3343 ) 21.8426 Tj
0 -446.1879 Td
(3344 ) 21.8426 Tj
0 -455.6813 Td
(3345 ) 21.8426 Tj
0 -465.1747 Td
(3346 ) 21.8426 Tj
0 -474.668 Td
(3347 ) 21.8426 Tj
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(3348 ) 21.8426 Tj
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(3349 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/ide.c  Page 2) 157.2665 Tj
0 -28.4801 Td
(3350 void) 39.3166 Tj
0 -37.9735 Td
(3351 ide_init\(void\)) 83.0018 Tj
0 -47.4668 Td
(3352 {) 26.2111 Tj
0 -56.9602 Td
(3353   int i;) 56.7907 Tj
0 -66.4535 Td
(3354 ) 21.8426 Tj
0 -75.9469 Td
(3355   initlock\(&ide_lock, "ide"\);) 148.5295 Tj
0 -85.4403 Td
(3356   pic_enable\(IRQ_IDE\);) 117.9499 Tj
0 -94.9336 Td
(3357   ioapic_enable\(IRQ_IDE, ncpu - 1\);) 174.7406 Tj
0 -104.427 Td
(3358   ide_wait_ready\(0\);) 109.2129 Tj
0 -113.9203 Td
(3359 ) 21.8426 Tj
0 -123.4137 Td
(3360   // Check if disk 1 is present) 157.2665 Tj
0 -132.9071 Td
(3361   outb\(0x1f6, 0xe0 | \(1<<4\)\);) 148.5295 Tj
0 -142.4004 Td
(3362   for\(i=0; i<1000; i++\){) 126.6869 Tj
0 -151.8938 Td
(3363     if\(inb\(0x1f7\) != 0\){) 126.6869 Tj
0 -161.3871 Td
(3364       disk_1_present = 1;) 131.0554 Tj
0 -170.8805 Td
(3365       break;) 74.2647 Tj
0 -180.3739 Td
(3366     }) 43.6851 Tj
0 -189.8672 Td
(3367   }) 34.9481 Tj
0 -199.3606 Td
(3368 ) 21.8426 Tj
0 -208.8539 Td
(3369   // Switch back to disk 0.) 139.7925 Tj
0 -218.3473 Td
(3370   outb\(0x1f6, 0xe0 | \(0<<4\)\);) 148.5295 Tj
0 -227.8407 Td
(3371 }) 26.2111 Tj
0 -237.334 Td
(3372 ) 21.8426 Tj
0 -246.8274 Td
(3373 // Start the request for b.  Caller must hold ide_lock.) 262.1109 Tj
0 -256.3207 Td
(3374 static void) 69.8962 Tj
0 -265.8141 Td
(3375 ide_start_request\(struct buf *b\)) 161.635 Tj
0 -275.3075 Td
(3376 {) 26.2111 Tj
0 -284.8008 Td
(3377   if\(b == 0\)) 74.2647 Tj
0 -294.2942 Td
(3378     panic\("ide_start_request"\);) 157.2665 Tj
0 -303.7875 Td
(3379 ) 21.8426 Tj
0 -313.2809 Td
(3380   ide_wait_ready\(0\);) 109.2129 Tj
0 -322.7743 Td
(3381   outb\(0x3f6, 0\);  // generate interrupt) 196.5831 Tj
0 -332.2676 Td
(3382   outb\(0x1f2, 1\);  // number of sectors) 192.2146 Tj
0 -341.761 Td
(3383   outb\(0x1f3, b->sector & 0xff\);) 161.635 Tj
0 -351.2543 Td
(3384   outb\(0x1f4, \(b->sector >> 8\) & 0xff\);) 192.2146 Tj
0 -360.7477 Td
(3385   outb\(0x1f5, \(b->sector >> 16\) & 0xff\);) 196.5831 Tj
0 -370.2411 Td
(3386   outb\(0x1f6, 0xe0 | \(\(b->dev&1\)<<4\) | \(\(b->sector>\
>24\)&0x0f\)\);) 297.059 Tj
0 -379.7344 Td
(3387   if\(b->flags & B_DIRTY\){) 131.0554 Tj
0 -389.2278 Td
(3388     outb\(0x1f7, IDE_CMD_WRITE\);) 157.2665 Tj
0 -398.7211 Td
(3389     outsl\(0x1f0, b->data, 512/4\);) 166.0035 Tj
0 -408.2145 Td
(3390   } else {) 65.5277 Tj
0 -417.7079 Td
(3391     outb\(0x1f7, IDE_CMD_READ\);) 152.898 Tj
0 -427.2012 Td
(3392   }) 34.9481 Tj
0 -436.6946 Td
(3393 }) 26.2111 Tj
0 -446.1879 Td
(3394 ) 21.8426 Tj
0 -455.6813 Td
(3395 ) 21.8426 Tj
0 -465.1747 Td
(3396 ) 21.8426 Tj
0 -474.668 Td
(3397 ) 21.8426 Tj
0 -484.1614 Td
(3398 ) 21.8426 Tj
0 -493.6547 Td
(3399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 33) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 41 41
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/ide.c  Page 3) 157.2665 Tj
0 -28.4801 Td
(3400 // Interrupt handler.) 113.5814 Tj
0 -37.9735 Td
(3401 void) 39.3166 Tj
0 -47.4668 Td
(3402 ide_intr\(void\)) 83.0018 Tj
0 -56.9602 Td
(3403 {) 26.2111 Tj
0 -66.4535 Td
(3404   struct buf *b;) 91.7388 Tj
0 -75.9469 Td
(3405 ) 21.8426 Tj
0 -85.4403 Td
(3406   acquire\(&ide_lock\);) 113.5814 Tj
0 -94.9336 Td
(3407   if\(\(b = ide_queue\) == 0\){) 139.7925 Tj
0 -104.427 Td
(3408     release\(&ide_lock\);) 122.3184 Tj
0 -113.9203 Td
(3409     return;) 69.8962 Tj
0 -123.4137 Td
(3410   }) 34.9481 Tj
0 -132.9071 Td
(3411 ) 21.8426 Tj
0 -142.4004 Td
(3412   // Read data if needed.) 131.0554 Tj
0 -151.8938 Td
(3413   if\(!\(b->flags & B_DIRTY\) && ide_wait_ready\(1\) >= 0\)) 253.3738 Tj
0 -161.3871 Td
(3414     insl\(0x1f0, b->data, 512/4\);) 161.635 Tj
0 -170.8805 Td
(3415 ) 21.8426 Tj
0 -180.3739 Td
(3416   // Wake process waiting for this buf.) 192.2146 Tj
0 -189.8672 Td
(3417   b->flags |= B_VALID;) 117.9499 Tj
0 -199.3606 Td
(3418   b->flags &= ~B_DIRTY;) 122.3184 Tj
0 -208.8539 Td
(3419   wakeup\(b\);) 74.2647 Tj
0 -218.3473 Td
(3420 ) 21.8426 Tj
0 -227.8407 Td
(3421   // Start disk on next buf in queue.) 183.4776 Tj
0 -237.334 Td
(3422   if\(\(ide_queue = b->qnext\) != 0\)) 166.0035 Tj
0 -246.8274 Td
(3423     ide_start_request\(ide_queue\);) 166.0035 Tj
0 -256.3207 Td
(3424 ) 21.8426 Tj
0 -265.8141 Td
(3425   release\(&ide_lock\);) 113.5814 Tj
0 -275.3075 Td
(3426 }) 26.2111 Tj
0 -284.8008 Td
(3427 ) 21.8426 Tj
0 -294.2942 Td
(3428 ) 21.8426 Tj
0 -303.7875 Td
(3429 ) 21.8426 Tj
0 -313.2809 Td
(3430 ) 21.8426 Tj
0 -322.7743 Td
(3431 ) 21.8426 Tj
0 -332.2676 Td
(3432 ) 21.8426 Tj
0 -341.761 Td
(3433 ) 21.8426 Tj
0 -351.2543 Td
(3434 ) 21.8426 Tj
0 -360.7477 Td
(3435 ) 21.8426 Tj
0 -370.2411 Td
(3436 ) 21.8426 Tj
0 -379.7344 Td
(3437 ) 21.8426 Tj
0 -389.2278 Td
(3438 ) 21.8426 Tj
0 -398.7211 Td
(3439 ) 21.8426 Tj
0 -408.2145 Td
(3440 ) 21.8426 Tj
0 -417.7079 Td
(3441 ) 21.8426 Tj
0 -427.2012 Td
(3442 ) 21.8426 Tj
0 -436.6946 Td
(3443 ) 21.8426 Tj
0 -446.1879 Td
(3444 ) 21.8426 Tj
0 -455.6813 Td
(3445 ) 21.8426 Tj
0 -465.1747 Td
(3446 ) 21.8426 Tj
0 -474.668 Td
(3447 ) 21.8426 Tj
0 -484.1614 Td
(3448 ) 21.8426 Tj
0 -493.6547 Td
(3449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 34) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/ide.c  Page 4) 157.2665 Tj
0 -28.4801 Td
(3450 // Sync buf with disk.) 117.9499 Tj
0 -37.9735 Td
(3451 // If B_DIRTY is set, write buf to disk, clear B_DIRTY, se\
t B_VALID.) 318.9016 Tj
0 -47.4668 Td
(3452 // Else if B_VALID is not set, read buf from disk, set B_V\
ALID.) 297.059 Tj
0 -56.9602 Td
(3453 void) 39.3166 Tj
0 -66.4535 Td
(3454 ide_rw\(struct buf *b\)) 113.5814 Tj
0 -75.9469 Td
(3455 {) 26.2111 Tj
0 -85.4403 Td
(3456   struct buf **pp;) 100.4758 Tj
0 -94.9336 Td
(3457 ) 21.8426 Tj
0 -104.427 Td
(3458   if\(!\(b->flags & B_BUSY\)\)) 135.4239 Tj
0 -113.9203 Td
(3459     panic\("ide_rw: buf not busy"\);) 170.3721 Tj
0 -123.4137 Td
(3460   if\(\(b->flags & \(B_VALID|B_DIRTY\)\) == B_VALID\)) 227.1628 Tj
0 -132.9071 Td
(3461     panic\("ide_rw: nothing to do"\);) 174.7406 Tj
0 -142.4004 Td
(3462   if\(b->dev != 0 && !disk_1_present\)) 179.1091 Tj
0 -151.8938 Td
(3463     panic\("ide disk 1 not present"\);) 179.1091 Tj
0 -161.3871 Td
(3464 ) 21.8426 Tj
0 -170.8805 Td
(3465   acquire\(&ide_lock\);) 113.5814 Tj
0 -180.3739 Td
(3466 ) 21.8426 Tj
0 -189.8672 Td
(3467   // Append b to ide_queue.) 139.7925 Tj
0 -199.3606 Td
(3468   b->qnext = 0;) 87.3703 Tj
0 -208.8539 Td
(3469   for\(pp=&ide_queue; *pp; pp=&\(*pp\)->qnext\)) 209.6887 Tj
0 -218.3473 Td
(3470     ;) 43.6851 Tj
0 -227.8407 Td
(3471   *pp = b;) 65.5277 Tj
0 -237.334 Td
(3472 ) 21.8426 Tj
0 -246.8274 Td
(3473   // Start disk if necessary.) 148.5295 Tj
0 -256.3207 Td
(3474   if\(ide_queue == b\)) 109.2129 Tj
0 -265.8141 Td
(3475     ide_start_request\(b\);) 131.0554 Tj
0 -275.3075 Td
(3476 ) 21.8426 Tj
0 -284.8008 Td
(3477   // Wait for request to finish.) 161.635 Tj
0 -294.2942 Td
(3478   // Assuming will not sleep too long: ignore cp->killed.) 270.8479 Tj
0 -303.7875 Td
(3479   while\(\(b->flags & \(B_VALID|B_DIRTY\)\) != B_VALID\)) 240.2683 Tj
0 -313.2809 Td
(3480     sleep\(b, &ide_lock\);) 126.6869 Tj
0 -322.7743 Td
(3481 ) 21.8426 Tj
0 -332.2676 Td
(3482   release\(&ide_lock\);) 113.5814 Tj
0 -341.761 Td
(3483 }) 26.2111 Tj
0 -351.2543 Td
(3484 ) 21.8426 Tj
0 -360.7477 Td
(3485 ) 21.8426 Tj
0 -370.2411 Td
(3486 ) 21.8426 Tj
0 -379.7344 Td
(3487 ) 21.8426 Tj
0 -389.2278 Td
(3488 ) 21.8426 Tj
0 -398.7211 Td
(3489 ) 21.8426 Tj
0 -408.2145 Td
(3490 ) 21.8426 Tj
0 -417.7079 Td
(3491 ) 21.8426 Tj
0 -427.2012 Td
(3492 ) 21.8426 Tj
0 -436.6946 Td
(3493 ) 21.8426 Tj
0 -446.1879 Td
(3494 ) 21.8426 Tj
0 -455.6813 Td
(3495 ) 21.8426 Tj
0 -465.1747 Td
(3496 ) 21.8426 Tj
0 -474.668 Td
(3497 ) 21.8426 Tj
0 -484.1614 Td
(3498 ) 21.8426 Tj
0 -493.6547 Td
(3499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 34) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 42 42
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/bio.c  Page 1) 157.2665 Tj
0 -28.4801 Td
(3500 // Buffer cache.) 91.7388 Tj
0 -37.9735 Td
(3501 //) 30.5796 Tj
0 -47.4668 Td
(3502 // The buffer cache is a linked list of buf structures hol\
ding) 292.6905 Tj
0 -56.9602 Td
(3503 // cached copies of disk block contents.  Caching disk blo\
cks) 288.322 Tj
0 -66.4535 Td
(3504 // in memory reduces the number of disk reads and also pro\
vides) 297.059 Tj
0 -75.9469 Td
(3505 // a synchronization point for disk blocks used by multipl\
e processes.) 327.6386 Tj
0 -85.4403 Td
(3506 //) 30.5796 Tj
0 -94.9336 Td
(3507 // Interface:) 78.6333 Tj
0 -104.427 Td
(3508 // * To get a buffer for a particular disk block, call bre\
ad.) 288.322 Tj
0 -113.9203 Td
(3509 // * After changing buffer data, call bwrite to flush it t\
o disk.) 305.796 Tj
0 -123.4137 Td
(3510 // * When done with the buffer, call brelse.) 214.0572 Tj
0 -132.9071 Td
(3511 // * Do not use the buffer after calling brelse.) 231.5313 Tj
0 -142.4004 Td
(3512 // * Only one process at a time can use a buffer,) 235.8998 Tj
0 -151.8938 Td
(3513 //     so do not keep them longer than necessary.) 235.8998 Tj
0 -161.3871 Td
(3514 //) 30.5796 Tj
0 -170.8805 Td
(3515 // The implementation uses three state flags internally:) 266.4794 Tj
0 -180.3739 Td
(3516 // * B_BUSY: the block has been returned from bread) 244.6368 Tj
0 -189.8672 Td
(3517 //     and has not been passed back to brelse.) 222.7942 Tj
0 -199.3606 Td
(3518 // * B_VALID: the buffer data has been initialized) 240.2683 Tj
0 -208.8539 Td
(3519 //     with the associated disk block contents.) 227.1628 Tj
0 -218.3473 Td
(3520 // * B_DIRTY: the buffer data has been modified) 227.1628 Tj
0 -227.8407 Td
(3521 //     and needs to be written to disk.) 192.2146 Tj
0 -237.334 Td
(3522 ) 21.8426 Tj
0 -246.8274 Td
(3523 #include "types.h") 100.4758 Tj
0 -256.3207 Td
(3524 #include "defs.h") 96.1073 Tj
0 -265.8141 Td
(3525 #include "param.h") 100.4758 Tj
0 -275.3075 Td
(3526 #include "spinlock.h") 113.5814 Tj
0 -284.8008 Td
(3527 #include "buf.h") 91.7388 Tj
0 -294.2942 Td
(3528 ) 21.8426 Tj
0 -303.7875 Td
(3529 struct buf buf[NBUF];) 113.5814 Tj
0 -313.2809 Td
(3530 struct spinlock buf_table_lock;) 157.2665 Tj
0 -322.7743 Td
(3531 ) 21.8426 Tj
0 -332.2676 Td
(3532 // Linked list of all buffers, through prev/next.) 235.8998 Tj
0 -341.761 Td
(3533 // bufhead->next is most recently used.) 192.2146 Tj
0 -351.2543 Td
(3534 // bufhead->tail is least recently used.) 196.5831 Tj
0 -360.7477 Td
(3535 struct buf bufhead;) 104.8443 Tj
0 -370.2411 Td
(3536 ) 21.8426 Tj
0 -379.7344 Td
(3537 void) 39.3166 Tj
0 -389.2278 Td
(3538 binit\(void\)) 69.8962 Tj
0 -398.7211 Td
(3539 {) 26.2111 Tj
0 -408.2145 Td
(3540   struct buf *b;) 91.7388 Tj
0 -417.7079 Td
(3541 ) 21.8426 Tj
0 -427.2012 Td
(3542   initlock\(&buf_table_lock, "buf_table"\);) 200.9517 Tj
0 -436.6946 Td
(3543 ) 21.8426 Tj
0 -446.1879 Td
(3544 ) 21.8426 Tj
0 -455.6813 Td
(3545 ) 21.8426 Tj
0 -465.1747 Td
(3546 ) 21.8426 Tj
0 -474.668 Td
(3547 ) 21.8426 Tj
0 -484.1614 Td
(3548 ) 21.8426 Tj
0 -493.6547 Td
(3549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 35) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/bio.c  Page 2) 157.2665 Tj
0 -28.4801 Td
(3550   // Create linked list of buffers) 170.3721 Tj
0 -37.9735 Td
(3551   bufhead.prev = &bufhead;) 135.4239 Tj
0 -47.4668 Td
(3552   bufhead.next = &bufhead;) 135.4239 Tj
0 -56.9602 Td
(3553   for\(b = buf; b < buf+NBUF; b++\){) 170.3721 Tj
0 -66.4535 Td
(3554     b->next = bufhead.next;) 139.7925 Tj
0 -75.9469 Td
(3555     b->prev = &bufhead;) 122.3184 Tj
0 -85.4403 Td
(3556     bufhead.next->prev = b;) 139.7925 Tj
0 -94.9336 Td
(3557     bufhead.next = b;) 113.5814 Tj
0 -104.427 Td
(3558   }) 34.9481 Tj
0 -113.9203 Td
(3559 }) 26.2111 Tj
0 -123.4137 Td
(3560 ) 21.8426 Tj
0 -132.9071 Td
(3561 // Look through buffer cache for sector on device dev.) 257.7424 Tj
0 -142.4004 Td
(3562 // If not found, allocate fresh block.) 187.8461 Tj
0 -151.8938 Td
(3563 // In either case, return locked buffer.) 196.5831 Tj
0 -161.3871 Td
(3564 static struct buf*) 100.4758 Tj
0 -170.8805 Td
(3565 bget\(uint dev, uint sector\)) 139.7925 Tj
0 -180.3739 Td
(3566 {) 26.2111 Tj
0 -189.8672 Td
(3567   struct buf *b;) 91.7388 Tj
0 -199.3606 Td
(3568 ) 21.8426 Tj
0 -208.8539 Td
(3569   acquire\(&buf_table_lock\);) 139.7925 Tj
0 -218.3473 Td
(3570 ) 21.8426 Tj
0 -227.8407 Td
(3571  loop:) 48.0537 Tj
0 -237.334 Td
(3572   // Try for cached block.) 135.4239 Tj
0 -246.8274 Td
(3573   for\(b = bufhead.next; b != &bufhead; b = b->next\){) 249.0053 Tj
0 -256.3207 Td
(3574     if\(\(b->flags & \(B_BUSY|B_VALID\)\) &&) 192.2146 Tj
0 -265.8141 Td
(3575        b->dev == dev && b->sector == sector\){) 218.4257 Tj
0 -275.3075 Td
(3576       if\(b->flags & B_BUSY\){) 144.161 Tj
0 -284.8008 Td
(3577         sleep\(buf, &buf_table_lock\);) 179.1091 Tj
0 -294.2942 Td
(3578         goto loop;) 100.4758 Tj
0 -303.7875 Td
(3579       }) 52.4222 Tj
0 -313.2809 Td
(3580       b->flags |= B_BUSY;) 131.0554 Tj
0 -322.7743 Td
(3581       release\(&buf_table_lock\);) 157.2665 Tj
0 -332.2676 Td
(3582       return b;) 87.3703 Tj
0 -341.761 Td
(3583     }) 43.6851 Tj
0 -351.2543 Td
(3584   }) 34.9481 Tj
0 -360.7477 Td
(3585 ) 21.8426 Tj
0 -370.2411 Td
(3586   // Allocate fresh block.) 135.4239 Tj
0 -379.7344 Td
(3587   for\(b = bufhead.prev; b != &bufhead; b = b->prev\){) 249.0053 Tj
0 -389.2278 Td
(3588     if\(\(b->flags & B_BUSY\) == 0\){) 166.0035 Tj
0 -398.7211 Td
(3589       b->flags = B_BUSY;) 126.6869 Tj
0 -408.2145 Td
(3590       b->dev = dev;) 104.8443 Tj
0 -417.7079 Td
(3591       b->sector = sector;) 131.0554 Tj
0 -427.2012 Td
(3592       release\(&buf_table_lock\);) 157.2665 Tj
0 -436.6946 Td
(3593       return b;) 87.3703 Tj
0 -446.1879 Td
(3594     }) 43.6851 Tj
0 -455.6813 Td
(3595   }) 34.9481 Tj
0 -465.1747 Td
(3596   panic\("bget: no buffers"\);) 144.161 Tj
0 -474.668 Td
(3597 }) 26.2111 Tj
0 -484.1614 Td
(3598 ) 21.8426 Tj
0 -493.6547 Td
(3599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 35) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 43 43
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/bio.c  Page 3) 157.2665 Tj
0 -28.4801 Td
(3600 // Return a B_BUSY buf with the contents of the indicated \
disk sector.) 327.6386 Tj
0 -37.9735 Td
(3601 struct buf*) 69.8962 Tj
0 -47.4668 Td
(3602 bread\(uint dev, uint sector\)) 144.161 Tj
0 -56.9602 Td
(3603 {) 26.2111 Tj
0 -66.4535 Td
(3604   struct buf *b;) 91.7388 Tj
0 -75.9469 Td
(3605 ) 21.8426 Tj
0 -85.4403 Td
(3606   b = bget\(dev, sector\);) 126.6869 Tj
0 -94.9336 Td
(3607   if\(!\(b->flags & B_VALID\)\)) 139.7925 Tj
0 -104.427 Td
(3608     ide_rw\(b\);) 83.0018 Tj
0 -113.9203 Td
(3609   return b;) 69.8962 Tj
0 -123.4137 Td
(3610 }) 26.2111 Tj
0 -132.9071 Td
(3611 ) 21.8426 Tj
0 -142.4004 Td
(3612 // Write buf's contents to disk.  Must be locked.) 235.8998 Tj
0 -151.8938 Td
(3613 void) 39.3166 Tj
0 -161.3871 Td
(3614 bwrite\(struct buf *b\)) 113.5814 Tj
0 -170.8805 Td
(3615 {) 26.2111 Tj
0 -180.3739 Td
(3616   if\(\(b->flags & B_BUSY\) == 0\)) 152.898 Tj
0 -189.8672 Td
(3617     panic\("bwrite"\);) 109.2129 Tj
0 -199.3606 Td
(3618   b->flags |= B_DIRTY;) 117.9499 Tj
0 -208.8539 Td
(3619   ide_rw\(b\);) 74.2647 Tj
0 -218.3473 Td
(3620 }) 26.2111 Tj
0 -227.8407 Td
(3621 ) 21.8426 Tj
0 -237.334 Td
(3622 // Release the buffer buf.) 135.4239 Tj
0 -246.8274 Td
(3623 void) 39.3166 Tj
0 -256.3207 Td
(3624 brelse\(struct buf *b\)) 113.5814 Tj
0 -265.8141 Td
(3625 {) 26.2111 Tj
0 -275.3075 Td
(3626   if\(\(b->flags & B_BUSY\) == 0\)) 152.898 Tj
0 -284.8008 Td
(3627     panic\("brelse"\);) 109.2129 Tj
0 -294.2942 Td
(3628 ) 21.8426 Tj
0 -303.7875 Td
(3629   acquire\(&buf_table_lock\);) 139.7925 Tj
0 -313.2809 Td
(3630 ) 21.8426 Tj
0 -322.7743 Td
(3631   b->next->prev = b->prev;) 135.4239 Tj
0 -332.2676 Td
(3632   b->prev->next = b->next;) 135.4239 Tj
0 -341.761 Td
(3633   b->next = bufhead.next;) 131.0554 Tj
0 -351.2543 Td
(3634   b->prev = &bufhead;) 113.5814 Tj
0 -360.7477 Td
(3635   bufhead.next->prev = b;) 131.0554 Tj
0 -370.2411 Td
(3636   bufhead.next = b;) 104.8443 Tj
0 -379.7344 Td
(3637 ) 21.8426 Tj
0 -389.2278 Td
(3638   b->flags &= ~B_BUSY;) 117.9499 Tj
0 -398.7211 Td
(3639   wakeup\(buf\);) 83.0018 Tj
0 -408.2145 Td
(3640 ) 21.8426 Tj
0 -417.7079 Td
(3641   release\(&buf_table_lock\);) 139.7925 Tj
0 -427.2012 Td
(3642 }) 26.2111 Tj
0 -436.6946 Td
(3643 ) 21.8426 Tj
0 -446.1879 Td
(3644 ) 21.8426 Tj
0 -455.6813 Td
(3645 ) 21.8426 Tj
0 -465.1747 Td
(3646 ) 21.8426 Tj
0 -474.668 Td
(3647 ) 21.8426 Tj
0 -484.1614 Td
(3648 ) 21.8426 Tj
0 -493.6547 Td
(3649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 36) 34.9481 Tj
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 1) 152.898 Tj
0 -28.4801 Td
(3650 // File system implementation.  Four layers:) 214.0572 Tj
0 -37.9735 Td
(3651 //   + Blocks: allocator for raw disk blocks.) 218.4257 Tj
0 -47.4668 Td
(3652 //   + Files: inode allocator, reading, writing, metadata.) 275.2164 Tj
0 -56.9602 Td
(3653 //   + Directories: inode with special contents \(list of \
other inodes!\)) 332.0071 Tj
0 -66.4535 Td
(3654 //   + Names: paths like /usr/rtm/xv6/fs.c for convenient \
naming.) 305.796 Tj
0 -75.9469 Td
(3655 //) 30.5796 Tj
0 -85.4403 Td
(3656 // Disk layout is: superblock, inodes, block in-use bitmap\
, data blocks.) 336.3756 Tj
0 -94.9336 Td
(3657 //) 30.5796 Tj
0 -104.427 Td
(3658 // This file contains the low-level file system manipulati\
on) 283.9534 Tj
0 -113.9203 Td
(3659 // routines.  The \(higher-level\) system call implementat\
ions) 283.9534 Tj
0 -123.4137 Td
(3660 // are in sysfile.c.) 109.2129 Tj
0 -132.9071 Td
(3661 ) 21.8426 Tj
0 -142.4004 Td
(3662 #include "types.h") 100.4758 Tj
0 -151.8938 Td
(3663 #include "defs.h") 96.1073 Tj
0 -161.3871 Td
(3664 #include "param.h") 100.4758 Tj
0 -170.8805 Td
(3665 #include "stat.h") 96.1073 Tj
0 -180.3739 Td
(3666 #include "mmu.h") 91.7388 Tj
0 -189.8672 Td
(3667 #include "proc.h") 96.1073 Tj
0 -199.3606 Td
(3668 #include "spinlock.h") 113.5814 Tj
0 -208.8539 Td
(3669 #include "buf.h") 91.7388 Tj
0 -218.3473 Td
(3670 #include "fs.h") 87.3703 Tj
0 -227.8407 Td
(3671 #include "fsvar.h") 100.4758 Tj
0 -237.334 Td
(3672 #include "dev.h") 91.7388 Tj
0 -246.8274 Td
(3673 ) 21.8426 Tj
0 -256.3207 Td
(3674 #define min\(a, b\) \(\(a\) < \(b\) ? \(a\) : \(b\)\)) 200.9517 Tj
0 -265.8141 Td
(3675 static void itrunc\(struct inode*\);) 170.3721 Tj
0 -275.3075 Td
(3676 ) 21.8426 Tj
0 -284.8008 Td
(3677 // Read the super block.) 126.6869 Tj
0 -294.2942 Td
(3678 static void) 69.8962 Tj
0 -303.7875 Td
(3679 readsb\(int dev, struct superblock *sb\)) 187.8461 Tj
0 -313.2809 Td
(3680 {) 26.2111 Tj
0 -322.7743 Td
(3681   struct buf *bp;) 96.1073 Tj
0 -332.2676 Td
(3682 ) 21.8426 Tj
0 -341.761 Td
(3683   bp = bread\(dev, 1\);) 113.5814 Tj
0 -351.2543 Td
(3684   memmove\(sb, bp->data, sizeof\(*sb\)\);) 183.4776 Tj
0 -360.7477 Td
(3685   brelse\(bp\);) 78.6333 Tj
0 -370.2411 Td
(3686 }) 26.2111 Tj
0 -379.7344 Td
(3687 ) 21.8426 Tj
0 -389.2278 Td
(3688 // Zero a block.) 91.7388 Tj
0 -398.7211 Td
(3689 static void) 69.8962 Tj
0 -408.2145 Td
(3690 bzero\(int dev, int bno\)) 122.3184 Tj
0 -417.7079 Td
(3691 {) 26.2111 Tj
0 -427.2012 Td
(3692   struct buf *bp;) 96.1073 Tj
0 -436.6946 Td
(3693 ) 21.8426 Tj
0 -446.1879 Td
(3694   bp = bread\(dev, bno\);) 122.3184 Tj
0 -455.6813 Td
(3695   memset\(bp->data, 0, BSIZE\);) 148.5295 Tj
0 -465.1747 Td
(3696   bwrite\(bp\);) 78.6333 Tj
0 -474.668 Td
(3697   brelse\(bp\);) 78.6333 Tj
0 -484.1614 Td
(3698 }) 26.2111 Tj
0 -493.6547 Td
(3699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 36) 34.9481 Tj
Q
Q
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Q
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q
180 3960 5760 3460 re
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/DeviceGray {} CS
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 2) 152.898 Tj
0 -28.4801 Td
(3700 // Blocks.) 65.5277 Tj
0 -37.9735 Td
(3701 ) 21.8426 Tj
0 -47.4668 Td
(3702 // Allocate a disk block.) 131.0554 Tj
0 -56.9602 Td
(3703 static uint) 69.8962 Tj
0 -66.4535 Td
(3704 balloc\(uint dev\)) 91.7388 Tj
0 -75.9469 Td
(3705 {) 26.2111 Tj
0 -85.4403 Td
(3706   int b, bi, m;) 87.3703 Tj
0 -94.9336 Td
(3707   struct buf *bp;) 96.1073 Tj
0 -104.427 Td
(3708   struct superblock sb;) 122.3184 Tj
0 -113.9203 Td
(3709 ) 21.8426 Tj
0 -123.4137 Td
(3710   bp = 0;) 61.1592 Tj
0 -132.9071 Td
(3711   readsb\(dev, &sb\);) 104.8443 Tj
0 -142.4004 Td
(3712   for\(b = 0; b < sb.size; b += BPB\){) 179.1091 Tj
0 -151.8938 Td
(3713     bp = bread\(dev, BBLOCK\(b, sb.ninodes\)\);) 209.6887 Tj
0 -161.3871 Td
(3714     for\(bi = 0; bi < BPB; bi++\){) 161.635 Tj
0 -170.8805 Td
(3715       m = 1 << \(bi % 8\);) 126.6869 Tj
0 -180.3739 Td
(3716       if\(\(bp->data[bi/8] & m\) == 0\){  // Is block free\
?) 262.1109 Tj
0 -189.8672 Td
(3717         bp->data[bi/8] |= m;  // Mark block in use on disk\
.) 279.5849 Tj
0 -199.3606 Td
(3718         bwrite\(bp\);) 104.8443 Tj
0 -208.8539 Td
(3719         brelse\(bp\);) 104.8443 Tj
0 -218.3473 Td
(3720         return b + bi;) 117.9499 Tj
0 -227.8407 Td
(3721       }) 52.4222 Tj
0 -237.334 Td
(3722     }) 43.6851 Tj
0 -246.8274 Td
(3723     brelse\(bp\);) 87.3703 Tj
0 -256.3207 Td
(3724   }) 34.9481 Tj
0 -265.8141 Td
(3725   panic\("balloc: out of blocks"\);) 166.0035 Tj
0 -275.3075 Td
(3726 }) 26.2111 Tj
0 -284.8008 Td
(3727 ) 21.8426 Tj
0 -294.2942 Td
(3728 // Free a disk block.) 113.5814 Tj
0 -303.7875 Td
(3729 static void) 69.8962 Tj
0 -313.2809 Td
(3730 bfree\(int dev, uint b\)) 117.9499 Tj
0 -322.7743 Td
(3731 {) 26.2111 Tj
0 -332.2676 Td
(3732   struct buf *bp;) 96.1073 Tj
0 -341.761 Td
(3733   struct superblock sb;) 122.3184 Tj
0 -351.2543 Td
(3734   int bi, m;) 74.2647 Tj
0 -360.7477 Td
(3735 ) 21.8426 Tj
0 -370.2411 Td
(3736   bzero\(dev, b\);) 91.7388 Tj
0 -379.7344 Td
(3737 ) 21.8426 Tj
0 -389.2278 Td
(3738   readsb\(dev, &sb\);) 104.8443 Tj
0 -398.7211 Td
(3739   bp = bread\(dev, BBLOCK\(b, sb.ninodes\)\);) 200.9517 Tj
0 -408.2145 Td
(3740   bi = b % BPB;) 87.3703 Tj
0 -417.7079 Td
(3741   m = 1 << \(bi % 8\);) 109.2129 Tj
0 -427.2012 Td
(3742   if\(\(bp->data[bi/8] & m\) == 0\)) 157.2665 Tj
0 -436.6946 Td
(3743     panic\("freeing free block"\);) 161.635 Tj
0 -446.1879 Td
(3744   bp->data[bi/8] &= ~m;  // Mark block free on disk.) 249.0053 Tj
0 -455.6813 Td
(3745   bwrite\(bp\);) 78.6333 Tj
0 -465.1747 Td
(3746   brelse\(bp\);) 78.6333 Tj
0 -474.668 Td
(3747 }) 26.2111 Tj
0 -484.1614 Td
(3748 ) 21.8426 Tj
0 -493.6547 Td
(3749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 37) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
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[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 3) 152.898 Tj
0 -28.4801 Td
(3750 // Inodes.) 65.5277 Tj
0 -37.9735 Td
(3751 //) 30.5796 Tj
0 -47.4668 Td
(3752 // An inode is a single, unnamed file in the file system.) 270.8479 Tj
0 -56.9602 Td
(3753 // The inode disk structure holds metadata \(the type, dev\
ice numbers,) 323.2701 Tj
0 -66.4535 Td
(3754 // and data size\) along with a list of blocks where the a\
ssociated) 310.1645 Tj
0 -75.9469 Td
(3755 // data can be found.) 113.5814 Tj
0 -85.4403 Td
(3756 //) 30.5796 Tj
0 -94.9336 Td
(3757 // The inodes are laid out sequentially on disk immediatel\
y after) 305.796 Tj
0 -104.427 Td
(3758 // the superblock.  The kernel keeps a cache of the in-use) 275.2164 Tj
0 -113.9203 Td
(3759 // on-disk structures to provide a place for synchronizing\
 access) 305.796 Tj
0 -123.4137 Td
(3760 // to inodes shared between multiple processes.) 227.1628 Tj
0 -132.9071 Td
(3761 //) 30.5796 Tj
0 -142.4004 Td
(3762 // ip->ref counts the number of pointer references to this\
 cached) 305.796 Tj
0 -151.8938 Td
(3763 // inode; references are typically kept in struct file and\
 in cp->cwd.) 327.6386 Tj
0 -161.3871 Td
(3764 // When ip->ref falls to zero, the inode is no longer cach\
ed.) 288.322 Tj
0 -170.8805 Td
(3765 // It is an error to use an inode without holding a refere\
nce to it.) 318.9016 Tj
0 -180.3739 Td
(3766 //) 30.5796 Tj
0 -189.8672 Td
(3767 // Processes are only allowed to read and write inode) 253.3738 Tj
0 -199.3606 Td
(3768 // metadata and contents when holding the inode's lock,) 262.1109 Tj
0 -208.8539 Td
(3769 // represented by the I_BUSY flag in the in-memory copy.) 266.4794 Tj
0 -218.3473 Td
(3770 // Because inode locks are held during disk accesses,) 253.3738 Tj
0 -227.8407 Td
(3771 // they are implemented using a flag rather than with) 253.3738 Tj
0 -237.334 Td
(3772 // spin locks.  Callers are responsible for locking) 244.6368 Tj
0 -246.8274 Td
(3773 // inodes before passing them to routines in this file; le\
aving) 297.059 Tj
0 -256.3207 Td
(3774 // this responsibility with the caller makes it possible f\
or them) 305.796 Tj
0 -265.8141 Td
(3775 // to create arbitrarily-sized atomic operations.) 235.8998 Tj
0 -275.3075 Td
(3776 //) 30.5796 Tj
0 -284.8008 Td
(3777 // To give maximum control over locking to the callers,) 262.1109 Tj
0 -294.2942 Td
(3778 // the routines in this file that return inode pointers) 262.1109 Tj
0 -303.7875 Td
(3779 // return pointers to *unlocked* inodes.  It is the caller\
s') 283.9534 Tj
0 -313.2809 Td
(3780 // responsibility to lock them before using them.  A non-z\
ero) 288.322 Tj
0 -322.7743 Td
(3781 // ip->ref keeps these unlocked inodes in the cache.) 249.0053 Tj
0 -332.2676 Td
(3782 ) 21.8426 Tj
0 -341.761 Td
(3783 struct {) 56.7907 Tj
0 -351.2543 Td
(3784   struct spinlock lock;) 122.3184 Tj
0 -360.7477 Td
(3785   struct inode inode[NINODE];) 148.5295 Tj
0 -370.2411 Td
(3786 } icache;) 61.1592 Tj
0 -379.7344 Td
(3787 ) 21.8426 Tj
0 -389.2278 Td
(3788 void) 39.3166 Tj
0 -398.7211 Td
(3789 iinit\(void\)) 69.8962 Tj
0 -408.2145 Td
(3790 {) 26.2111 Tj
0 -417.7079 Td
(3791   initlock\(&icache.lock, "icache.lock"\);) 196.5831 Tj
0 -427.2012 Td
(3792 }) 26.2111 Tj
0 -436.6946 Td
(3793 ) 21.8426 Tj
0 -446.1879 Td
(3794 ) 21.8426 Tj
0 -455.6813 Td
(3795 ) 21.8426 Tj
0 -465.1747 Td
(3796 ) 21.8426 Tj
0 -474.668 Td
(3797 ) 21.8426 Tj
0 -484.1614 Td
(3798 ) 21.8426 Tj
0 -493.6547 Td
(3799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 37) 34.9481 Tj
Q
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pdfStartPage
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-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
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(Sep  3 10:05 2008  xv6/fs.c  Page 4) 152.898 Tj
0 -28.4801 Td
(3800 // Find the inode with number inum on device dev) 231.5313 Tj
0 -37.9735 Td
(3801 // and return the in-memory copy.) 166.0035 Tj
0 -47.4668 Td
(3802 static struct inode*) 109.2129 Tj
0 -56.9602 Td
(3803 iget\(uint dev, uint inum\)) 131.0554 Tj
0 -66.4535 Td
(3804 {) 26.2111 Tj
0 -75.9469 Td
(3805   struct inode *ip, *empty;) 139.7925 Tj
0 -85.4403 Td
(3806 ) 21.8426 Tj
0 -94.9336 Td
(3807   acquire\(&icache.lock\);) 126.6869 Tj
0 -104.427 Td
(3808 ) 21.8426 Tj
0 -113.9203 Td
(3809   // Try for cached inode.) 135.4239 Tj
0 -123.4137 Td
(3810   empty = 0;) 74.2647 Tj
0 -132.9071 Td
(3811   for\(ip = &icache.inode[0]; ip < &icache.inode[NINODE]; \
ip++\){) 297.059 Tj
0 -142.4004 Td
(3812     if\(ip->ref > 0 && ip->dev == dev && ip->inum == inum\)\
{) 275.2164 Tj
0 -151.8938 Td
(3813       ip->ref++;) 91.7388 Tj
0 -161.3871 Td
(3814       release\(&icache.lock\);) 144.161 Tj
0 -170.8805 Td
(3815       return ip;) 91.7388 Tj
0 -180.3739 Td
(3816     }) 43.6851 Tj
0 -189.8672 Td
(3817     if\(empty == 0 && ip->ref == 0\)    // Remember empty \
slot.) 288.322 Tj
0 -199.3606 Td
(3818       empty = ip;) 96.1073 Tj
0 -208.8539 Td
(3819   }) 34.9481 Tj
0 -218.3473 Td
(3820 ) 21.8426 Tj
0 -227.8407 Td
(3821   // Allocate fresh inode.) 135.4239 Tj
0 -237.334 Td
(3822   if\(empty == 0\)) 91.7388 Tj
0 -246.8274 Td
(3823     panic\("iget: no inodes"\);) 148.5295 Tj
0 -256.3207 Td
(3824 ) 21.8426 Tj
0 -265.8141 Td
(3825   ip = empty;) 78.6333 Tj
0 -275.3075 Td
(3826   ip->dev = dev;) 91.7388 Tj
0 -284.8008 Td
(3827   ip->inum = inum;) 100.4758 Tj
0 -294.2942 Td
(3828   ip->ref = 1;) 83.0018 Tj
0 -303.7875 Td
(3829   ip->flags = 0;) 91.7388 Tj
0 -313.2809 Td
(3830   release\(&icache.lock\);) 126.6869 Tj
0 -322.7743 Td
(3831 ) 21.8426 Tj
0 -332.2676 Td
(3832   return ip;) 74.2647 Tj
0 -341.761 Td
(3833 }) 26.2111 Tj
0 -351.2543 Td
(3834 ) 21.8426 Tj
0 -360.7477 Td
(3835 // Increment reference count for ip.) 179.1091 Tj
0 -370.2411 Td
(3836 // Returns ip to enable ip = idup\(ip1\) idiom.) 218.4257 Tj
0 -379.7344 Td
(3837 struct inode*) 78.6333 Tj
0 -389.2278 Td
(3838 idup\(struct inode *ip\)) 117.9499 Tj
0 -398.7211 Td
(3839 {) 26.2111 Tj
0 -408.2145 Td
(3840   acquire\(&icache.lock\);) 126.6869 Tj
0 -417.7079 Td
(3841   ip->ref++;) 74.2647 Tj
0 -427.2012 Td
(3842   release\(&icache.lock\);) 126.6869 Tj
0 -436.6946 Td
(3843   return ip;) 74.2647 Tj
0 -446.1879 Td
(3844 }) 26.2111 Tj
0 -455.6813 Td
(3845 ) 21.8426 Tj
0 -465.1747 Td
(3846 ) 21.8426 Tj
0 -474.668 Td
(3847 ) 21.8426 Tj
0 -484.1614 Td
(3848 ) 21.8426 Tj
0 -493.6547 Td
(3849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 38) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 5) 152.898 Tj
0 -28.4801 Td
(3850 // Lock the given inode.) 126.6869 Tj
0 -37.9735 Td
(3851 void) 39.3166 Tj
0 -47.4668 Td
(3852 ilock\(struct inode *ip\)) 122.3184 Tj
0 -56.9602 Td
(3853 {) 26.2111 Tj
0 -66.4535 Td
(3854   struct buf *bp;) 96.1073 Tj
0 -75.9469 Td
(3855   struct dinode *dip;) 113.5814 Tj
0 -85.4403 Td
(3856 ) 21.8426 Tj
0 -94.9336 Td
(3857   if\(ip == 0 || ip->ref < 1\)) 144.161 Tj
0 -104.427 Td
(3858     panic\("ilock"\);) 104.8443 Tj
0 -113.9203 Td
(3859 ) 21.8426 Tj
0 -123.4137 Td
(3860   acquire\(&icache.lock\);) 126.6869 Tj
0 -132.9071 Td
(3861   while\(ip->flags & I_BUSY\)) 139.7925 Tj
0 -142.4004 Td
(3862     sleep\(ip, &icache.lock\);) 144.161 Tj
0 -151.8938 Td
(3863   ip->flags |= I_BUSY;) 117.9499 Tj
0 -161.3871 Td
(3864   release\(&icache.lock\);) 126.6869 Tj
0 -170.8805 Td
(3865 ) 21.8426 Tj
0 -180.3739 Td
(3866   if\(!\(ip->flags & I_VALID\)\){) 148.5295 Tj
0 -189.8672 Td
(3867     bp = bread\(ip->dev, IBLOCK\(ip->inum\)\);) 205.3202 Tj
0 -199.3606 Td
(3868     dip = \(struct dinode*\)bp->data + ip->inum%IPB;) 240.2683 Tj
0 -208.8539 Td
(3869     ip->type = dip->type;) 131.0554 Tj
0 -218.3473 Td
(3870     ip->major = dip->major;) 139.7925 Tj
0 -227.8407 Td
(3871     ip->minor = dip->minor;) 139.7925 Tj
0 -237.334 Td
(3872     ip->nlink = dip->nlink;) 139.7925 Tj
0 -246.8274 Td
(3873     ip->size = dip->size;) 131.0554 Tj
0 -256.3207 Td
(3874     memmove\(ip->addrs, dip->addrs, sizeof\(ip->addrs\)\);) 257.7424 Tj
0 -265.8141 Td
(3875     brelse\(bp\);) 87.3703 Tj
0 -275.3075 Td
(3876     ip->flags |= I_VALID;) 131.0554 Tj
0 -284.8008 Td
(3877     if\(ip->type == 0\)) 113.5814 Tj
0 -294.2942 Td
(3878       panic\("ilock: no type"\);) 152.898 Tj
0 -303.7875 Td
(3879   }) 34.9481 Tj
0 -313.2809 Td
(3880 }) 26.2111 Tj
0 -322.7743 Td
(3881 ) 21.8426 Tj
0 -332.2676 Td
(3882 // Unlock the given inode.) 135.4239 Tj
0 -341.761 Td
(3883 void) 39.3166 Tj
0 -351.2543 Td
(3884 iunlock\(struct inode *ip\)) 131.0554 Tj
0 -360.7477 Td
(3885 {) 26.2111 Tj
0 -370.2411 Td
(3886   if\(ip == 0 || !\(ip->flags & I_BUSY\) || ip->ref < 1\)) 253.3738 Tj
0 -379.7344 Td
(3887     panic\("iunlock"\);) 113.5814 Tj
0 -389.2278 Td
(3888 ) 21.8426 Tj
0 -398.7211 Td
(3889   acquire\(&icache.lock\);) 126.6869 Tj
0 -408.2145 Td
(3890   ip->flags &= ~I_BUSY;) 122.3184 Tj
0 -417.7079 Td
(3891   wakeup\(ip\);) 78.6333 Tj
0 -427.2012 Td
(3892   release\(&icache.lock\);) 126.6869 Tj
0 -436.6946 Td
(3893 }) 26.2111 Tj
0 -446.1879 Td
(3894 ) 21.8426 Tj
0 -455.6813 Td
(3895 ) 21.8426 Tj
0 -465.1747 Td
(3896 ) 21.8426 Tj
0 -474.668 Td
(3897 ) 21.8426 Tj
0 -484.1614 Td
(3898 ) 21.8426 Tj
0 -493.6547 Td
(3899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 38) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 46 46
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 6) 152.898 Tj
0 -28.4801 Td
(3900 // Caller holds reference to unlocked ip.  Drop reference.) 275.2164 Tj
0 -37.9735 Td
(3901 void) 39.3166 Tj
0 -47.4668 Td
(3902 iput\(struct inode *ip\)) 117.9499 Tj
0 -56.9602 Td
(3903 {) 26.2111 Tj
0 -66.4535 Td
(3904   acquire\(&icache.lock\);) 126.6869 Tj
0 -75.9469 Td
(3905   if\(ip->ref == 1 && \(ip->flags & I_VALID\) && ip->nlink\
 == 0\){) 292.6905 Tj
0 -85.4403 Td
(3906     // inode is no longer used: truncate and free inode.) 266.4794 Tj
0 -94.9336 Td
(3907     if\(ip->flags & I_BUSY\)) 135.4239 Tj
0 -104.427 Td
(3908       panic\("iput busy"\);) 131.0554 Tj
0 -113.9203 Td
(3909     ip->flags |= I_BUSY;) 126.6869 Tj
0 -123.4137 Td
(3910     release\(&icache.lock\);) 135.4239 Tj
0 -132.9071 Td
(3911     itrunc\(ip\);) 87.3703 Tj
0 -142.4004 Td
(3912     ip->type = 0;) 96.1073 Tj
0 -151.8938 Td
(3913     iupdate\(ip\);) 91.7388 Tj
0 -161.3871 Td
(3914     acquire\(&icache.lock\);) 135.4239 Tj
0 -170.8805 Td
(3915     ip->flags &= ~I_BUSY;) 131.0554 Tj
0 -180.3739 Td
(3916     wakeup\(ip\);) 87.3703 Tj
0 -189.8672 Td
(3917   }) 34.9481 Tj
0 -199.3606 Td
(3918   ip->ref--;) 74.2647 Tj
0 -208.8539 Td
(3919   release\(&icache.lock\);) 126.6869 Tj
0 -218.3473 Td
(3920 }) 26.2111 Tj
0 -227.8407 Td
(3921 ) 21.8426 Tj
0 -237.334 Td
(3922 // Common idiom: unlock, then put.) 170.3721 Tj
0 -246.8274 Td
(3923 void) 39.3166 Tj
0 -256.3207 Td
(3924 iunlockput\(struct inode *ip\)) 144.161 Tj
0 -265.8141 Td
(3925 {) 26.2111 Tj
0 -275.3075 Td
(3926   iunlock\(ip\);) 83.0018 Tj
0 -284.8008 Td
(3927   iput\(ip\);) 69.8962 Tj
0 -294.2942 Td
(3928 }) 26.2111 Tj
0 -303.7875 Td
(3929 ) 21.8426 Tj
0 -313.2809 Td
(3930 ) 21.8426 Tj
0 -322.7743 Td
(3931 ) 21.8426 Tj
0 -332.2676 Td
(3932 ) 21.8426 Tj
0 -341.761 Td
(3933 ) 21.8426 Tj
0 -351.2543 Td
(3934 ) 21.8426 Tj
0 -360.7477 Td
(3935 ) 21.8426 Tj
0 -370.2411 Td
(3936 ) 21.8426 Tj
0 -379.7344 Td
(3937 ) 21.8426 Tj
0 -389.2278 Td
(3938 ) 21.8426 Tj
0 -398.7211 Td
(3939 ) 21.8426 Tj
0 -408.2145 Td
(3940 ) 21.8426 Tj
0 -417.7079 Td
(3941 ) 21.8426 Tj
0 -427.2012 Td
(3942 ) 21.8426 Tj
0 -436.6946 Td
(3943 ) 21.8426 Tj
0 -446.1879 Td
(3944 ) 21.8426 Tj
0 -455.6813 Td
(3945 ) 21.8426 Tj
0 -465.1747 Td
(3946 ) 21.8426 Tj
0 -474.668 Td
(3947 ) 21.8426 Tj
0 -484.1614 Td
(3948 ) 21.8426 Tj
0 -493.6547 Td
(3949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 39) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 7) 152.898 Tj
0 -28.4801 Td
(3950 // Allocate a new inode with the given type on device dev.) 275.2164 Tj
0 -37.9735 Td
(3951 struct inode*) 78.6333 Tj
0 -47.4668 Td
(3952 ialloc\(uint dev, short type\)) 144.161 Tj
0 -56.9602 Td
(3953 {) 26.2111 Tj
0 -66.4535 Td
(3954   int inum;) 69.8962 Tj
0 -75.9469 Td
(3955   struct buf *bp;) 96.1073 Tj
0 -85.4403 Td
(3956   struct dinode *dip;) 113.5814 Tj
0 -94.9336 Td
(3957   struct superblock sb;) 122.3184 Tj
0 -104.427 Td
(3958 ) 21.8426 Tj
0 -113.9203 Td
(3959   readsb\(dev, &sb\);) 104.8443 Tj
0 -123.4137 Td
(3960   for\(inum = 1; inum < sb.ninodes; inum++\){  // loop ove\
r inode blocks) 327.6386 Tj
0 -132.9071 Td
(3961     bp = bread\(dev, IBLOCK\(inum\)\);) 170.3721 Tj
0 -142.4004 Td
(3962     dip = \(struct dinode*\)bp->data + inum%IPB;) 222.7942 Tj
0 -151.8938 Td
(3963     if\(dip->type == 0\){  // a free inode) 196.5831 Tj
0 -161.3871 Td
(3964       memset\(dip, 0, sizeof\(*dip\)\);) 174.7406 Tj
0 -170.8805 Td
(3965       dip->type = type;) 122.3184 Tj
0 -180.3739 Td
(3966       bwrite\(bp\);   // mark it allocated on the disk) 249.0053 Tj
0 -189.8672 Td
(3967       brelse\(bp\);) 96.1073 Tj
0 -199.3606 Td
(3968       return iget\(dev, inum\);) 148.5295 Tj
0 -208.8539 Td
(3969     }) 43.6851 Tj
0 -218.3473 Td
(3970     brelse\(bp\);) 87.3703 Tj
0 -227.8407 Td
(3971   }) 34.9481 Tj
0 -237.334 Td
(3972   panic\("ialloc: no inodes"\);) 148.5295 Tj
0 -246.8274 Td
(3973 }) 26.2111 Tj
0 -256.3207 Td
(3974 ) 21.8426 Tj
0 -265.8141 Td
(3975 // Copy inode, which has changed, from memory to disk.) 257.7424 Tj
0 -275.3075 Td
(3976 void) 39.3166 Tj
0 -284.8008 Td
(3977 iupdate\(struct inode *ip\)) 131.0554 Tj
0 -294.2942 Td
(3978 {) 26.2111 Tj
0 -303.7875 Td
(3979   struct buf *bp;) 96.1073 Tj
0 -313.2809 Td
(3980   struct dinode *dip;) 113.5814 Tj
0 -322.7743 Td
(3981 ) 21.8426 Tj
0 -332.2676 Td
(3982   bp = bread\(ip->dev, IBLOCK\(ip->inum\)\);) 196.5831 Tj
0 -341.761 Td
(3983   dip = \(struct dinode*\)bp->data + ip->inum%IPB;) 231.5313 Tj
0 -351.2543 Td
(3984   dip->type = ip->type;) 122.3184 Tj
0 -360.7477 Td
(3985   dip->major = ip->major;) 131.0554 Tj
0 -370.2411 Td
(3986   dip->minor = ip->minor;) 131.0554 Tj
0 -379.7344 Td
(3987   dip->nlink = ip->nlink;) 131.0554 Tj
0 -389.2278 Td
(3988   dip->size = ip->size;) 122.3184 Tj
0 -398.7211 Td
(3989   memmove\(dip->addrs, ip->addrs, sizeof\(ip->addrs\)\);) 249.0053 Tj
0 -408.2145 Td
(3990   bwrite\(bp\);) 78.6333 Tj
0 -417.7079 Td
(3991   brelse\(bp\);) 78.6333 Tj
0 -427.2012 Td
(3992 }) 26.2111 Tj
0 -436.6946 Td
(3993 ) 21.8426 Tj
0 -446.1879 Td
(3994 ) 21.8426 Tj
0 -455.6813 Td
(3995 ) 21.8426 Tj
0 -465.1747 Td
(3996 ) 21.8426 Tj
0 -474.668 Td
(3997 ) 21.8426 Tj
0 -484.1614 Td
(3998 ) 21.8426 Tj
0 -493.6547 Td
(3999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 39) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 47 47
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 8) 152.898 Tj
0 -28.4801 Td
(4000 // Inode contents) 96.1073 Tj
0 -37.9735 Td
(4001 //) 30.5796 Tj
0 -47.4668 Td
(4002 // The contents \(data\) associated with each inode is sto\
red) 279.5849 Tj
0 -56.9602 Td
(4003 // in a sequence of blocks on the disk.  The first NDIRECT\
 blocks) 305.796 Tj
0 -66.4535 Td
(4004 // are listed in ip->addrs[].  The next NINDIRECT blocks a\
re) 283.9534 Tj
0 -75.9469 Td
(4005 // listed in the block ip->addrs[INDIRECT].) 209.6887 Tj
0 -85.4403 Td
(4006 ) 21.8426 Tj
0 -94.9336 Td
(4007 // Return the disk block address of the nth block in inode\
 ip.) 292.6905 Tj
0 -104.427 Td
(4008 // If there is no such block, alloc controls whether one i\
s allocated.) 327.6386 Tj
0 -113.9203 Td
(4009 static uint) 69.8962 Tj
0 -123.4137 Td
(4010 bmap\(struct inode *ip, uint bn, int alloc\)) 205.3202 Tj
0 -132.9071 Td
(4011 {) 26.2111 Tj
0 -142.4004 Td
(4012   uint addr, *a;) 91.7388 Tj
0 -151.8938 Td
(4013   struct buf *bp;) 96.1073 Tj
0 -161.3871 Td
(4014 ) 21.8426 Tj
0 -170.8805 Td
(4015   if\(bn < NDIRECT\){) 104.8443 Tj
0 -180.3739 Td
(4016     if\(\(addr = ip->addrs[bn]\) == 0\){) 179.1091 Tj
0 -189.8672 Td
(4017       if\(!alloc\)) 91.7388 Tj
0 -199.3606 Td
(4018         return -1;) 100.4758 Tj
0 -208.8539 Td
(4019       ip->addrs[bn] = addr = balloc\(ip->dev\);) 218.4257 Tj
0 -218.3473 Td
(4020     }) 43.6851 Tj
0 -227.8407 Td
(4021     return addr;) 91.7388 Tj
0 -237.334 Td
(4022   }) 34.9481 Tj
0 -246.8274 Td
(4023   bn -= NDIRECT;) 91.7388 Tj
0 -256.3207 Td
(4024 ) 21.8426 Tj
0 -265.8141 Td
(4025   if\(bn < NINDIRECT\){) 113.5814 Tj
0 -275.3075 Td
(4026     // Load indirect block, allocating if necessary.) 249.0053 Tj
0 -284.8008 Td
(4027     if\(\(addr = ip->addrs[INDIRECT]\) == 0\){) 205.3202 Tj
0 -294.2942 Td
(4028       if\(!alloc\)) 91.7388 Tj
0 -303.7875 Td
(4029         return -1;) 100.4758 Tj
0 -313.2809 Td
(4030       ip->addrs[INDIRECT] = addr = balloc\(ip->dev\);) 244.6368 Tj
0 -322.7743 Td
(4031     }) 43.6851 Tj
0 -332.2676 Td
(4032     bp = bread\(ip->dev, addr\);) 152.898 Tj
0 -341.761 Td
(4033     a = \(uint*\)bp->data;) 126.6869 Tj
0 -351.2543 Td
(4034 ) 21.8426 Tj
0 -360.7477 Td
(4035     if\(\(addr = a[bn]\) == 0\){) 144.161 Tj
0 -370.2411 Td
(4036       if\(!alloc\){) 96.1073 Tj
0 -379.7344 Td
(4037         brelse\(bp\);) 104.8443 Tj
0 -389.2278 Td
(4038         return -1;) 100.4758 Tj
0 -398.7211 Td
(4039       }) 52.4222 Tj
0 -408.2145 Td
(4040       a[bn] = addr = balloc\(ip->dev\);) 183.4776 Tj
0 -417.7079 Td
(4041       bwrite\(bp\);) 96.1073 Tj
0 -427.2012 Td
(4042     }) 43.6851 Tj
0 -436.6946 Td
(4043     brelse\(bp\);) 87.3703 Tj
0 -446.1879 Td
(4044     return addr;) 91.7388 Tj
0 -455.6813 Td
(4045   }) 34.9481 Tj
0 -465.1747 Td
(4046 ) 21.8426 Tj
0 -474.668 Td
(4047   panic\("bmap: out of range"\);) 152.898 Tj
0 -484.1614 Td
(4048 }) 26.2111 Tj
0 -493.6547 Td
(4049 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 40) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 9) 152.898 Tj
0 -28.4801 Td
(4050 // Truncate inode \(discard contents\).) 183.4776 Tj
0 -37.9735 Td
(4051 static void) 69.8962 Tj
0 -47.4668 Td
(4052 itrunc\(struct inode *ip\)) 126.6869 Tj
0 -56.9602 Td
(4053 {) 26.2111 Tj
0 -66.4535 Td
(4054   int i, j;) 69.8962 Tj
0 -75.9469 Td
(4055   struct buf *bp;) 96.1073 Tj
0 -85.4403 Td
(4056   uint *a;) 65.5277 Tj
0 -94.9336 Td
(4057 ) 21.8426 Tj
0 -104.427 Td
(4058   for\(i = 0; i < NDIRECT; i++\){) 157.2665 Tj
0 -113.9203 Td
(4059     if\(ip->addrs[i]\){) 113.5814 Tj
0 -123.4137 Td
(4060       bfree\(ip->dev, ip->addrs[i]\);) 174.7406 Tj
0 -132.9071 Td
(4061       ip->addrs[i] = 0;) 122.3184 Tj
0 -142.4004 Td
(4062     }) 43.6851 Tj
0 -151.8938 Td
(4063   }) 34.9481 Tj
0 -161.3871 Td
(4064 ) 21.8426 Tj
0 -170.8805 Td
(4065   if\(ip->addrs[INDIRECT]\){) 135.4239 Tj
0 -180.3739 Td
(4066     bp = bread\(ip->dev, ip->addrs[INDIRECT]\);) 218.4257 Tj
0 -189.8672 Td
(4067     a = \(uint*\)bp->data;) 126.6869 Tj
0 -199.3606 Td
(4068     for\(j = 0; j < NINDIRECT; j++\){) 174.7406 Tj
0 -208.8539 Td
(4069       if\(a[j]\)) 83.0018 Tj
0 -218.3473 Td
(4070         bfree\(ip->dev, a[j]\);) 148.5295 Tj
0 -227.8407 Td
(4071     }) 43.6851 Tj
0 -237.334 Td
(4072     brelse\(bp\);) 87.3703 Tj
0 -246.8274 Td
(4073     ip->addrs[INDIRECT] = 0;) 144.161 Tj
0 -256.3207 Td
(4074   }) 34.9481 Tj
0 -265.8141 Td
(4075 ) 21.8426 Tj
0 -275.3075 Td
(4076   ip->size = 0;) 87.3703 Tj
0 -284.8008 Td
(4077   iupdate\(ip\);) 83.0018 Tj
0 -294.2942 Td
(4078 }) 26.2111 Tj
0 -303.7875 Td
(4079 ) 21.8426 Tj
0 -313.2809 Td
(4080 // Copy stat information from inode.) 179.1091 Tj
0 -322.7743 Td
(4081 void) 39.3166 Tj
0 -332.2676 Td
(4082 stati\(struct inode *ip, struct stat *st\)) 196.5831 Tj
0 -341.761 Td
(4083 {) 26.2111 Tj
0 -351.2543 Td
(4084   st->dev = ip->dev;) 109.2129 Tj
0 -360.7477 Td
(4085   st->ino = ip->inum;) 113.5814 Tj
0 -370.2411 Td
(4086   st->type = ip->type;) 117.9499 Tj
0 -379.7344 Td
(4087   st->nlink = ip->nlink;) 126.6869 Tj
0 -389.2278 Td
(4088   st->size = ip->size;) 117.9499 Tj
0 -398.7211 Td
(4089 }) 26.2111 Tj
0 -408.2145 Td
(4090 ) 21.8426 Tj
0 -417.7079 Td
(4091 ) 21.8426 Tj
0 -427.2012 Td
(4092 ) 21.8426 Tj
0 -436.6946 Td
(4093 ) 21.8426 Tj
0 -446.1879 Td
(4094 ) 21.8426 Tj
0 -455.6813 Td
(4095 ) 21.8426 Tj
0 -465.1747 Td
(4096 ) 21.8426 Tj
0 -474.668 Td
(4097 ) 21.8426 Tj
0 -484.1614 Td
(4098 ) 21.8426 Tj
0 -493.6547 Td
(4099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 40) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 48 48
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 10) 157.2665 Tj
0 -28.4801 Td
(4100 // Read data from inode.) 126.6869 Tj
0 -37.9735 Td
(4101 int) 34.9481 Tj
0 -47.4668 Td
(4102 readi\(struct inode *ip, char *dst, uint off, uint n\)) 249.0053 Tj
0 -56.9602 Td
(4103 {) 26.2111 Tj
0 -66.4535 Td
(4104   uint tot, m;) 83.0018 Tj
0 -75.9469 Td
(4105   struct buf *bp;) 96.1073 Tj
0 -85.4403 Td
(4106 ) 21.8426 Tj
0 -94.9336 Td
(4107   if\(ip->type == T_DEV\){) 126.6869 Tj
0 -104.427 Td
(4108     if\(ip->major < 0 || ip->major >= NDEV || !devsw[ip->m\
ajor].read\)) 318.9016 Tj
0 -113.9203 Td
(4109       return -1;) 91.7388 Tj
0 -123.4137 Td
(4110     return devsw[ip->major].read\(ip, dst, n\);) 218.4257 Tj
0 -132.9071 Td
(4111   }) 34.9481 Tj
0 -142.4004 Td
(4112 ) 21.8426 Tj
0 -151.8938 Td
(4113   if\(off > ip->size || off + n < off\)) 183.4776 Tj
0 -161.3871 Td
(4114     return -1;) 83.0018 Tj
0 -170.8805 Td
(4115   if\(off + n > ip->size\)) 126.6869 Tj
0 -180.3739 Td
(4116     n = ip->size - off;) 122.3184 Tj
0 -189.8672 Td
(4117 ) 21.8426 Tj
0 -199.3606 Td
(4118   for\(tot=0; tot<n; tot+=m, off+=m, dst+=m\){) 214.0572 Tj
0 -208.8539 Td
(4119     bp = bread\(ip->dev, bmap\(ip, off/BSIZE, 0\)\);) 231.5313 Tj
0 -218.3473 Td
(4120     m = min\(n - tot, BSIZE - off%BSIZE\);) 196.5831 Tj
0 -227.8407 Td
(4121     memmove\(dst, bp->data + off%BSIZE, m\);) 205.3202 Tj
0 -237.334 Td
(4122     brelse\(bp\);) 87.3703 Tj
0 -246.8274 Td
(4123   }) 34.9481 Tj
0 -256.3207 Td
(4124   return n;) 69.8962 Tj
0 -265.8141 Td
(4125 }) 26.2111 Tj
0 -275.3075 Td
(4126 ) 21.8426 Tj
0 -284.8008 Td
(4127 ) 21.8426 Tj
0 -294.2942 Td
(4128 ) 21.8426 Tj
0 -303.7875 Td
(4129 ) 21.8426 Tj
0 -313.2809 Td
(4130 ) 21.8426 Tj
0 -322.7743 Td
(4131 ) 21.8426 Tj
0 -332.2676 Td
(4132 ) 21.8426 Tj
0 -341.761 Td
(4133 ) 21.8426 Tj
0 -351.2543 Td
(4134 ) 21.8426 Tj
0 -360.7477 Td
(4135 ) 21.8426 Tj
0 -370.2411 Td
(4136 ) 21.8426 Tj
0 -379.7344 Td
(4137 ) 21.8426 Tj
0 -389.2278 Td
(4138 ) 21.8426 Tj
0 -398.7211 Td
(4139 ) 21.8426 Tj
0 -408.2145 Td
(4140 ) 21.8426 Tj
0 -417.7079 Td
(4141 ) 21.8426 Tj
0 -427.2012 Td
(4142 ) 21.8426 Tj
0 -436.6946 Td
(4143 ) 21.8426 Tj
0 -446.1879 Td
(4144 ) 21.8426 Tj
0 -455.6813 Td
(4145 ) 21.8426 Tj
0 -465.1747 Td
(4146 ) 21.8426 Tj
0 -474.668 Td
(4147 ) 21.8426 Tj
0 -484.1614 Td
(4148 ) 21.8426 Tj
0 -493.6547 Td
(4149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 41) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 11) 157.2665 Tj
0 -28.4801 Td
(4150 // Write data to inode.) 122.3184 Tj
0 -37.9735 Td
(4151 int) 34.9481 Tj
0 -47.4668 Td
(4152 writei\(struct inode *ip, char *src, uint off, uint n\)) 253.3738 Tj
0 -56.9602 Td
(4153 {) 26.2111 Tj
0 -66.4535 Td
(4154   uint tot, m;) 83.0018 Tj
0 -75.9469 Td
(4155   struct buf *bp;) 96.1073 Tj
0 -85.4403 Td
(4156 ) 21.8426 Tj
0 -94.9336 Td
(4157   if\(ip->type == T_DEV\){) 126.6869 Tj
0 -104.427 Td
(4158     if\(ip->major < 0 || ip->major >= NDEV || !devsw[ip->m\
ajor].write\)) 323.2701 Tj
0 -113.9203 Td
(4159       return -1;) 91.7388 Tj
0 -123.4137 Td
(4160     return devsw[ip->major].write\(ip, src, n\);) 222.7942 Tj
0 -132.9071 Td
(4161   }) 34.9481 Tj
0 -142.4004 Td
(4162 ) 21.8426 Tj
0 -151.8938 Td
(4163   if\(off + n < off\)) 104.8443 Tj
0 -161.3871 Td
(4164     return -1;) 83.0018 Tj
0 -170.8805 Td
(4165   if\(off + n > MAXFILE*BSIZE\)) 148.5295 Tj
0 -180.3739 Td
(4166     n = MAXFILE*BSIZE - off;) 144.161 Tj
0 -189.8672 Td
(4167 ) 21.8426 Tj
0 -199.3606 Td
(4168   for\(tot=0; tot<n; tot+=m, off+=m, src+=m\){) 214.0572 Tj
0 -208.8539 Td
(4169     bp = bread\(ip->dev, bmap\(ip, off/BSIZE, 1\)\);) 231.5313 Tj
0 -218.3473 Td
(4170     m = min\(n - tot, BSIZE - off%BSIZE\);) 196.5831 Tj
0 -227.8407 Td
(4171     memmove\(bp->data + off%BSIZE, src, m\);) 205.3202 Tj
0 -237.334 Td
(4172     bwrite\(bp\);) 87.3703 Tj
0 -246.8274 Td
(4173     brelse\(bp\);) 87.3703 Tj
0 -256.3207 Td
(4174   }) 34.9481 Tj
0 -265.8141 Td
(4175 ) 21.8426 Tj
0 -275.3075 Td
(4176   if\(n > 0 && off > ip->size\){) 152.898 Tj
0 -284.8008 Td
(4177     ip->size = off;) 104.8443 Tj
0 -294.2942 Td
(4178     iupdate\(ip\);) 91.7388 Tj
0 -303.7875 Td
(4179   }) 34.9481 Tj
0 -313.2809 Td
(4180   return n;) 69.8962 Tj
0 -322.7743 Td
(4181 }) 26.2111 Tj
0 -332.2676 Td
(4182 ) 21.8426 Tj
0 -341.761 Td
(4183 ) 21.8426 Tj
0 -351.2543 Td
(4184 ) 21.8426 Tj
0 -360.7477 Td
(4185 ) 21.8426 Tj
0 -370.2411 Td
(4186 ) 21.8426 Tj
0 -379.7344 Td
(4187 ) 21.8426 Tj
0 -389.2278 Td
(4188 ) 21.8426 Tj
0 -398.7211 Td
(4189 ) 21.8426 Tj
0 -408.2145 Td
(4190 ) 21.8426 Tj
0 -417.7079 Td
(4191 ) 21.8426 Tj
0 -427.2012 Td
(4192 ) 21.8426 Tj
0 -436.6946 Td
(4193 ) 21.8426 Tj
0 -446.1879 Td
(4194 ) 21.8426 Tj
0 -455.6813 Td
(4195 ) 21.8426 Tj
0 -465.1747 Td
(4196 ) 21.8426 Tj
0 -474.668 Td
(4197 ) 21.8426 Tj
0 -484.1614 Td
(4198 ) 21.8426 Tj
0 -493.6547 Td
(4199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 41) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 49 49
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
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[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
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/DeviceGray {} CS
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 12) 157.2665 Tj
0 -28.4801 Td
(4200 // Directories) 83.0018 Tj
0 -37.9735 Td
(4201 ) 21.8426 Tj
0 -47.4668 Td
(4202 int) 34.9481 Tj
0 -56.9602 Td
(4203 namecmp\(const char *s, const char *t\)) 183.4776 Tj
0 -66.4535 Td
(4204 {) 26.2111 Tj
0 -75.9469 Td
(4205   return strncmp\(s, t, DIRSIZ\);) 157.2665 Tj
0 -85.4403 Td
(4206 }) 26.2111 Tj
0 -94.9336 Td
(4207 ) 21.8426 Tj
0 -104.427 Td
(4208 // Look for a directory entry in a directory.) 218.4257 Tj
0 -113.9203 Td
(4209 // If found, set *poff to byte offset of entry.) 227.1628 Tj
0 -123.4137 Td
(4210 // Caller must have already locked dp.) 187.8461 Tj
0 -132.9071 Td
(4211 struct inode*) 78.6333 Tj
0 -142.4004 Td
(4212 dirlookup\(struct inode *dp, char *name, uint *poff\)) 244.6368 Tj
0 -151.8938 Td
(4213 {) 26.2111 Tj
0 -161.3871 Td
(4214   uint off, inum;) 96.1073 Tj
0 -170.8805 Td
(4215   struct buf *bp;) 96.1073 Tj
0 -180.3739 Td
(4216   struct dirent *de;) 109.2129 Tj
0 -189.8672 Td
(4217 ) 21.8426 Tj
0 -199.3606 Td
(4218   if\(dp->type != T_DIR\)) 122.3184 Tj
0 -208.8539 Td
(4219     panic\("dirlookup not DIR"\);) 157.2665 Tj
0 -218.3473 Td
(4220 ) 21.8426 Tj
0 -227.8407 Td
(4221   for\(off = 0; off < dp->size; off += BSIZE\){) 218.4257 Tj
0 -237.334 Td
(4222     bp = bread\(dp->dev, bmap\(dp, off / BSIZE, 0\)\);) 240.2683 Tj
0 -246.8274 Td
(4223     for\(de = \(struct dirent*\)bp->data;) 187.8461 Tj
0 -256.3207 Td
(4224         de < \(struct dirent*\)\(bp->data + BSIZE\);) 231.5313 Tj
0 -265.8141 Td
(4225         de++\){) 83.0018 Tj
0 -275.3075 Td
(4226       if\(de->inum == 0\)) 122.3184 Tj
0 -284.8008 Td
(4227         continue;) 96.1073 Tj
0 -294.2942 Td
(4228       if\(namecmp\(name, de->name\) == 0\){) 192.2146 Tj
0 -303.7875 Td
(4229         // entry matches path element) 183.4776 Tj
0 -313.2809 Td
(4230         if\(poff\)) 91.7388 Tj
0 -322.7743 Td
(4231           *poff = off + \(uchar*\)de - bp->data;) 222.7942 Tj
0 -332.2676 Td
(4232         inum = de->inum;) 126.6869 Tj
0 -341.761 Td
(4233         brelse\(bp\);) 104.8443 Tj
0 -351.2543 Td
(4234         return iget\(dp->dev, inum\);) 174.7406 Tj
0 -360.7477 Td
(4235       }) 52.4222 Tj
0 -370.2411 Td
(4236     }) 43.6851 Tj
0 -379.7344 Td
(4237     brelse\(bp\);) 87.3703 Tj
0 -389.2278 Td
(4238   }) 34.9481 Tj
0 -398.7211 Td
(4239   return 0;) 69.8962 Tj
0 -408.2145 Td
(4240 }) 26.2111 Tj
0 -417.7079 Td
(4241 ) 21.8426 Tj
0 -427.2012 Td
(4242 ) 21.8426 Tj
0 -436.6946 Td
(4243 ) 21.8426 Tj
0 -446.1879 Td
(4244 ) 21.8426 Tj
0 -455.6813 Td
(4245 ) 21.8426 Tj
0 -465.1747 Td
(4246 ) 21.8426 Tj
0 -474.668 Td
(4247 ) 21.8426 Tj
0 -484.1614 Td
(4248 ) 21.8426 Tj
0 -493.6547 Td
(4249 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 42) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 13) 157.2665 Tj
0 -28.4801 Td
(4250 // Write a new directory entry \(name, ino\) into the dire\
ctory dp.) 305.796 Tj
0 -37.9735 Td
(4251 int) 34.9481 Tj
0 -47.4668 Td
(4252 dirlink\(struct inode *dp, char *name, uint ino\)) 227.1628 Tj
0 -56.9602 Td
(4253 {) 26.2111 Tj
0 -66.4535 Td
(4254   int off;) 65.5277 Tj
0 -75.9469 Td
(4255   struct dirent de;) 104.8443 Tj
0 -85.4403 Td
(4256   struct inode *ip;) 104.8443 Tj
0 -94.9336 Td
(4257 ) 21.8426 Tj
0 -104.427 Td
(4258   // Check that name is not present.) 179.1091 Tj
0 -113.9203 Td
(4259   if\(\(ip = dirlookup\(dp, name, 0\)\) != 0\){) 200.9517 Tj
0 -123.4137 Td
(4260     iput\(ip\);) 78.6333 Tj
0 -132.9071 Td
(4261     return -1;) 83.0018 Tj
0 -142.4004 Td
(4262   }) 34.9481 Tj
0 -151.8938 Td
(4263 ) 21.8426 Tj
0 -161.3871 Td
(4264   // Look for an empty dirent.) 152.898 Tj
0 -170.8805 Td
(4265   for\(off = 0; off < dp->size; off += sizeof\(de\)\){) 240.2683 Tj
0 -180.3739 Td
(4266     if\(readi\(dp, \(char*\)&de, off, sizeof\(de\)\) != si\
zeof\(de\)\)) 283.9534 Tj
0 -189.8672 Td
(4267       panic\("dirlink read"\);) 144.161 Tj
0 -199.3606 Td
(4268     if\(de.inum == 0\)) 109.2129 Tj
0 -208.8539 Td
(4269       break;) 74.2647 Tj
0 -218.3473 Td
(4270   }) 34.9481 Tj
0 -227.8407 Td
(4271 ) 21.8426 Tj
0 -237.334 Td
(4272   strncpy\(de.name, name, DIRSIZ\);) 166.0035 Tj
0 -246.8274 Td
(4273   de.inum = ino;) 91.7388 Tj
0 -256.3207 Td
(4274   if\(writei\(dp, \(char*\)&de, off, sizeof\(de\)\) != siz\
eof\(de\)\)) 279.5849 Tj
0 -265.8141 Td
(4275     panic\("dirlink"\);) 113.5814 Tj
0 -275.3075 Td
(4276 ) 21.8426 Tj
0 -284.8008 Td
(4277   return 0;) 69.8962 Tj
0 -294.2942 Td
(4278 }) 26.2111 Tj
0 -303.7875 Td
(4279 ) 21.8426 Tj
0 -313.2809 Td
(4280 ) 21.8426 Tj
0 -322.7743 Td
(4281 ) 21.8426 Tj
0 -332.2676 Td
(4282 ) 21.8426 Tj
0 -341.761 Td
(4283 ) 21.8426 Tj
0 -351.2543 Td
(4284 ) 21.8426 Tj
0 -360.7477 Td
(4285 ) 21.8426 Tj
0 -370.2411 Td
(4286 ) 21.8426 Tj
0 -379.7344 Td
(4287 ) 21.8426 Tj
0 -389.2278 Td
(4288 ) 21.8426 Tj
0 -398.7211 Td
(4289 ) 21.8426 Tj
0 -408.2145 Td
(4290 ) 21.8426 Tj
0 -417.7079 Td
(4291 ) 21.8426 Tj
0 -427.2012 Td
(4292 ) 21.8426 Tj
0 -436.6946 Td
(4293 ) 21.8426 Tj
0 -446.1879 Td
(4294 ) 21.8426 Tj
0 -455.6813 Td
(4295 ) 21.8426 Tj
0 -465.1747 Td
(4296 ) 21.8426 Tj
0 -474.668 Td
(4297 ) 21.8426 Tj
0 -484.1614 Td
(4298 ) 21.8426 Tj
0 -493.6547 Td
(4299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 42) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 50 50
%%BeginPageSetup
%%PageOrientation: Landscape
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180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
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1 w
/DeviceGray {} cs
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q
180 3960 5760 3460 re
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/DeviceGray {} CS
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 14) 157.2665 Tj
0 -28.4801 Td
(4300 // Paths) 56.7907 Tj
0 -37.9735 Td
(4301 ) 21.8426 Tj
0 -47.4668 Td
(4302 // Copy the next path element from path into name.) 240.2683 Tj
0 -56.9602 Td
(4303 // Return a pointer to the element following the copied on\
e.) 283.9534 Tj
0 -66.4535 Td
(4304 // The returned path has no leading slashes,) 214.0572 Tj
0 -75.9469 Td
(4305 // so the caller can check *path=='\\0' to see if the name\
 is the last one.) 345.1126 Tj
0 -85.4403 Td
(4306 // If no name to remove, return 0.) 170.3721 Tj
0 -94.9336 Td
(4307 //) 30.5796 Tj
0 -104.427 Td
(4308 // Examples:) 74.2647 Tj
0 -113.9203 Td
(4309 //   skipelem\("a/bb/c", name\) = "bb/c", setting name = "\
a") 275.2164 Tj
0 -123.4137 Td
(4310 //   skipelem\("///a//bb", name\) = "bb", setting name = "\
a") 275.2164 Tj
0 -132.9071 Td
(4311 //   skipelem\("", name\) = skipelem\("////", name\) = 0) 249.0053 Tj
0 -142.4004 Td
(4312 //) 30.5796 Tj
0 -151.8938 Td
(4313 static char*) 74.2647 Tj
0 -161.3871 Td
(4314 skipelem\(char *path, char *name\)) 161.635 Tj
0 -170.8805 Td
(4315 {) 26.2111 Tj
0 -180.3739 Td
(4316   char *s;) 65.5277 Tj
0 -189.8672 Td
(4317   int len;) 65.5277 Tj
0 -199.3606 Td
(4318 ) 21.8426 Tj
0 -208.8539 Td
(4319   while\(*path == '/'\)) 113.5814 Tj
0 -218.3473 Td
(4320     path++;) 69.8962 Tj
0 -227.8407 Td
(4321   if\(*path == 0\)) 91.7388 Tj
0 -237.334 Td
(4322     return 0;) 78.6333 Tj
0 -246.8274 Td
(4323   s = path;) 69.8962 Tj
0 -256.3207 Td
(4324   while\(*path != '/' && *path != 0\)) 174.7406 Tj
0 -265.8141 Td
(4325     path++;) 69.8962 Tj
0 -275.3075 Td
(4326   len = path - s;) 96.1073 Tj
0 -284.8008 Td
(4327   if\(len >= DIRSIZ\)) 104.8443 Tj
0 -294.2942 Td
(4328     memmove\(name, s, DIRSIZ\);) 148.5295 Tj
0 -303.7875 Td
(4329   else {) 56.7907 Tj
0 -313.2809 Td
(4330     memmove\(name, s, len\);) 135.4239 Tj
0 -322.7743 Td
(4331     name[len] = 0;) 100.4758 Tj
0 -332.2676 Td
(4332   }) 34.9481 Tj
0 -341.761 Td
(4333   while\(*path == '/'\)) 113.5814 Tj
0 -351.2543 Td
(4334     path++;) 69.8962 Tj
0 -360.7477 Td
(4335   return path;) 83.0018 Tj
0 -370.2411 Td
(4336 }) 26.2111 Tj
0 -379.7344 Td
(4337 ) 21.8426 Tj
0 -389.2278 Td
(4338 ) 21.8426 Tj
0 -398.7211 Td
(4339 ) 21.8426 Tj
0 -408.2145 Td
(4340 ) 21.8426 Tj
0 -417.7079 Td
(4341 ) 21.8426 Tj
0 -427.2012 Td
(4342 ) 21.8426 Tj
0 -436.6946 Td
(4343 ) 21.8426 Tj
0 -446.1879 Td
(4344 ) 21.8426 Tj
0 -455.6813 Td
(4345 ) 21.8426 Tj
0 -465.1747 Td
(4346 ) 21.8426 Tj
0 -474.668 Td
(4347 ) 21.8426 Tj
0 -484.1614 Td
(4348 ) 21.8426 Tj
0 -493.6547 Td
(4349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 43) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/fs.c  Page 15) 157.2665 Tj
0 -28.4801 Td
(4350 // Look up and return the inode for a path name.) 231.5313 Tj
0 -37.9735 Td
(4351 // If parent != 0, return the inode for the parent and cop\
y the final) 323.2701 Tj
0 -47.4668 Td
(4352 // path element into name, which must have room for DIRSIZ\
 bytes.) 305.796 Tj
0 -56.9602 Td
(4353 static struct inode*) 109.2129 Tj
0 -66.4535 Td
(4354 _namei\(char *path, int parent, char *name\)) 205.3202 Tj
0 -75.9469 Td
(4355 {) 26.2111 Tj
0 -85.4403 Td
(4356   struct inode *ip, *next;) 135.4239 Tj
0 -94.9336 Td
(4357 ) 21.8426 Tj
0 -104.427 Td
(4358   if\(*path == '/'\)) 100.4758 Tj
0 -113.9203 Td
(4359     ip = iget\(ROOTDEV, 1\);) 135.4239 Tj
0 -123.4137 Td
(4360   else) 48.0537 Tj
0 -132.9071 Td
(4361     ip = idup\(cp->cwd\);) 122.3184 Tj
0 -142.4004 Td
(4362 ) 21.8426 Tj
0 -151.8938 Td
(4363   while\(\(path = skipelem\(path, name\)\) != 0\){) 214.0572 Tj
0 -161.3871 Td
(4364     ilock\(ip\);) 83.0018 Tj
0 -170.8805 Td
(4365     if\(ip->type != T_DIR\){) 135.4239 Tj
0 -180.3739 Td
(4366       iunlockput\(ip\);) 113.5814 Tj
0 -189.8672 Td
(4367       return 0;) 87.3703 Tj
0 -199.3606 Td
(4368     }) 43.6851 Tj
0 -208.8539 Td
(4369     if\(parent && *path == '\\0'\){) 161.635 Tj
0 -218.3473 Td
(4370       // Stop one level early.) 152.898 Tj
0 -227.8407 Td
(4371       iunlock\(ip\);) 100.4758 Tj
0 -237.334 Td
(4372       return ip;) 91.7388 Tj
0 -246.8274 Td
(4373     }) 43.6851 Tj
0 -256.3207 Td
(4374     if\(\(next = dirlookup\(ip, name, 0\)\) == 0\){) 218.4257 Tj
0 -265.8141 Td
(4375       iunlockput\(ip\);) 113.5814 Tj
0 -275.3075 Td
(4376       return 0;) 87.3703 Tj
0 -284.8008 Td
(4377     }) 43.6851 Tj
0 -294.2942 Td
(4378     iunlockput\(ip\);) 104.8443 Tj
0 -303.7875 Td
(4379     ip = next;) 83.0018 Tj
0 -313.2809 Td
(4380   }) 34.9481 Tj
0 -322.7743 Td
(4381   if\(parent\){) 78.6333 Tj
0 -332.2676 Td
(4382     iput\(ip\);) 78.6333 Tj
0 -341.761 Td
(4383     return 0;) 78.6333 Tj
0 -351.2543 Td
(4384   }) 34.9481 Tj
0 -360.7477 Td
(4385   return ip;) 74.2647 Tj
0 -370.2411 Td
(4386 }) 26.2111 Tj
0 -379.7344 Td
(4387 ) 21.8426 Tj
0 -389.2278 Td
(4388 struct inode*) 78.6333 Tj
0 -398.7211 Td
(4389 namei\(char *path\)) 96.1073 Tj
0 -408.2145 Td
(4390 {) 26.2111 Tj
0 -417.7079 Td
(4391   char name[DIRSIZ];) 109.2129 Tj
0 -427.2012 Td
(4392   return _namei\(path, 0, name\);) 157.2665 Tj
0 -436.6946 Td
(4393 }) 26.2111 Tj
0 -446.1879 Td
(4394 ) 21.8426 Tj
0 -455.6813 Td
(4395 struct inode*) 78.6333 Tj
0 -465.1747 Td
(4396 nameiparent\(char *path, char *name\)) 174.7406 Tj
0 -474.668 Td
(4397 {) 26.2111 Tj
0 -484.1614 Td
(4398   return _namei\(path, 1, name\);) 157.2665 Tj
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(4399 }) 26.2111 Tj
0 -522.1348 Td
(Sheet 43) 34.9481 Tj
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(4400 #include "types.h") 100.4758 Tj
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(4401 #include "defs.h") 96.1073 Tj
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(4402 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(4403 #include "file.h") 96.1073 Tj
0 -66.4535 Td
(4404 #include "spinlock.h") 113.5814 Tj
0 -75.9469 Td
(4405 #include "dev.h") 91.7388 Tj
0 -85.4403 Td
(4406 ) 21.8426 Tj
0 -94.9336 Td
(4407 struct devsw devsw[NDEV];) 131.0554 Tj
0 -104.427 Td
(4408 struct spinlock file_table_lock;) 161.635 Tj
0 -113.9203 Td
(4409 struct file file[NFILE];) 126.6869 Tj
0 -123.4137 Td
(4410 ) 21.8426 Tj
0 -132.9071 Td
(4411 void) 39.3166 Tj
0 -142.4004 Td
(4412 fileinit\(void\)) 83.0018 Tj
0 -151.8938 Td
(4413 {) 26.2111 Tj
0 -161.3871 Td
(4414   initlock\(&file_table_lock, "file_table"\);) 209.6887 Tj
0 -170.8805 Td
(4415 }) 26.2111 Tj
0 -180.3739 Td
(4416 ) 21.8426 Tj
0 -189.8672 Td
(4417 // Allocate a file structure.) 148.5295 Tj
0 -199.3606 Td
(4418 struct file*) 74.2647 Tj
0 -208.8539 Td
(4419 filealloc\(void\)) 87.3703 Tj
0 -218.3473 Td
(4420 {) 26.2111 Tj
0 -227.8407 Td
(4421   int i;) 56.7907 Tj
0 -237.334 Td
(4422 ) 21.8426 Tj
0 -246.8274 Td
(4423   acquire\(&file_table_lock\);) 144.161 Tj
0 -256.3207 Td
(4424   for\(i = 0; i < NFILE; i++\){) 148.5295 Tj
0 -265.8141 Td
(4425     if\(file[i].type == FD_CLOSED\){) 170.3721 Tj
0 -275.3075 Td
(4426       file[i].type = FD_NONE;) 148.5295 Tj
0 -284.8008 Td
(4427       file[i].ref = 1;) 117.9499 Tj
0 -294.2942 Td
(4428       release\(&file_table_lock\);) 161.635 Tj
0 -303.7875 Td
(4429       return file + i;) 117.9499 Tj
0 -313.2809 Td
(4430     }) 43.6851 Tj
0 -322.7743 Td
(4431   }) 34.9481 Tj
0 -332.2676 Td
(4432   release\(&file_table_lock\);) 144.161 Tj
0 -341.761 Td
(4433   return 0;) 69.8962 Tj
0 -351.2543 Td
(4434 }) 26.2111 Tj
0 -360.7477 Td
(4435 ) 21.8426 Tj
0 -370.2411 Td
(4436 // Increment ref count for file f.) 170.3721 Tj
0 -379.7344 Td
(4437 struct file*) 74.2647 Tj
0 -389.2278 Td
(4438 filedup\(struct file *f\)) 122.3184 Tj
0 -398.7211 Td
(4439 {) 26.2111 Tj
0 -408.2145 Td
(4440   acquire\(&file_table_lock\);) 144.161 Tj
0 -417.7079 Td
(4441   if\(f->ref < 1 || f->type == FD_CLOSED\)) 196.5831 Tj
0 -427.2012 Td
(4442     panic\("filedup"\);) 113.5814 Tj
0 -436.6946 Td
(4443   f->ref++;) 69.8962 Tj
0 -446.1879 Td
(4444   release\(&file_table_lock\);) 144.161 Tj
0 -455.6813 Td
(4445   return f;) 69.8962 Tj
0 -465.1747 Td
(4446 }) 26.2111 Tj
0 -474.668 Td
(4447 ) 21.8426 Tj
0 -484.1614 Td
(4448 ) 21.8426 Tj
0 -493.6547 Td
(4449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 44) 34.9481 Tj
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/DeviceGray {} CS
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[1 0 0 1 0 0] Tm
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[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/file.c  Page 2) 161.635 Tj
0 -28.4801 Td
(4450 // Close file f.  \(Decrement ref count, close when reache\
s 0.\)) 292.6905 Tj
0 -37.9735 Td
(4451 void) 39.3166 Tj
0 -47.4668 Td
(4452 fileclose\(struct file *f\)) 131.0554 Tj
0 -56.9602 Td
(4453 {) 26.2111 Tj
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(4454   struct file ff;) 96.1073 Tj
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(4455 ) 21.8426 Tj
0 -85.4403 Td
(4456   acquire\(&file_table_lock\);) 144.161 Tj
0 -94.9336 Td
(4457   if\(f->ref < 1 || f->type == FD_CLOSED\)) 196.5831 Tj
0 -104.427 Td
(4458     panic\("fileclose"\);) 122.3184 Tj
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(4459   if\(--f->ref > 0\){) 104.8443 Tj
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(4460     release\(&file_table_lock\);) 152.898 Tj
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(4461     return;) 69.8962 Tj
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(4462   }) 34.9481 Tj
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(4463   ff = *f;) 65.5277 Tj
0 -161.3871 Td
(4464   f->ref = 0;) 78.6333 Tj
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(4465   f->type = FD_CLOSED;) 117.9499 Tj
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(4466   release\(&file_table_lock\);) 144.161 Tj
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(4467 ) 21.8426 Tj
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(4468   if\(ff.type == FD_PIPE\)) 126.6869 Tj
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(4469     pipeclose\(ff.pipe, ff.writable\);) 179.1091 Tj
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(4470   else if\(ff.type == FD_INODE\)) 152.898 Tj
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(4471     iput\(ff.ip\);) 91.7388 Tj
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(4472   else) 48.0537 Tj
0 -246.8274 Td
(4473     panic\("fileclose"\);) 122.3184 Tj
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(4474 }) 26.2111 Tj
0 -265.8141 Td
(4475 ) 21.8426 Tj
0 -275.3075 Td
(4476 // Get metadata about file f.) 148.5295 Tj
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(4477 int) 34.9481 Tj
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(4478 filestat\(struct file *f, struct stat *st\)) 200.9517 Tj
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(4479 {) 26.2111 Tj
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(4480   if\(f->type == FD_INODE\){) 135.4239 Tj
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(4481     ilock\(f->ip\);) 96.1073 Tj
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(4482     stati\(f->ip, st\);) 113.5814 Tj
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(4483     iunlock\(f->ip\);) 104.8443 Tj
0 -351.2543 Td
(4484     return 0;) 78.6333 Tj
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(4485   }) 34.9481 Tj
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(4486   return -1;) 74.2647 Tj
0 -379.7344 Td
(4487 }) 26.2111 Tj
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(4488 ) 21.8426 Tj
0 -398.7211 Td
(4489 ) 21.8426 Tj
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(4490 ) 21.8426 Tj
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(4493 ) 21.8426 Tj
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(4494 ) 21.8426 Tj
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(4495 ) 21.8426 Tj
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(4496 ) 21.8426 Tj
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(4497 ) 21.8426 Tj
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(4498 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/file.c  Page 3) 161.635 Tj
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(4500 // Read from file f.  Addr is kernel address.) 218.4257 Tj
0 -37.9735 Td
(4501 int) 34.9481 Tj
0 -47.4668 Td
(4502 fileread\(struct file *f, char *addr, int n\)) 209.6887 Tj
0 -56.9602 Td
(4503 {) 26.2111 Tj
0 -66.4535 Td
(4504   int r;) 56.7907 Tj
0 -75.9469 Td
(4505 ) 21.8426 Tj
0 -85.4403 Td
(4506   if\(f->readable == 0\)) 117.9499 Tj
0 -94.9336 Td
(4507     return -1;) 83.0018 Tj
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(4508   if\(f->type == FD_PIPE\)) 126.6869 Tj
0 -113.9203 Td
(4509     return piperead\(f->pipe, addr, n\);) 187.8461 Tj
0 -123.4137 Td
(4510   if\(f->type == FD_INODE\){) 135.4239 Tj
0 -132.9071 Td
(4511     ilock\(f->ip\);) 96.1073 Tj
0 -142.4004 Td
(4512     if\(\(r = readi\(f->ip, addr, f->off, n\)\) > 0\)) 227.1628 Tj
0 -151.8938 Td
(4513       f->off += r;) 100.4758 Tj
0 -161.3871 Td
(4514     iunlock\(f->ip\);) 104.8443 Tj
0 -170.8805 Td
(4515     return r;) 78.6333 Tj
0 -180.3739 Td
(4516   }) 34.9481 Tj
0 -189.8672 Td
(4517   panic\("fileread"\);) 109.2129 Tj
0 -199.3606 Td
(4518 }) 26.2111 Tj
0 -208.8539 Td
(4519 ) 21.8426 Tj
0 -218.3473 Td
(4520 // Write to file f.  Addr is kernel address.) 214.0572 Tj
0 -227.8407 Td
(4521 int) 34.9481 Tj
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(4522 filewrite\(struct file *f, char *addr, int n\)) 214.0572 Tj
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(4523 {) 26.2111 Tj
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(4524   int r;) 56.7907 Tj
0 -265.8141 Td
(4525 ) 21.8426 Tj
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(4526   if\(f->writable == 0\)) 117.9499 Tj
0 -284.8008 Td
(4527     return -1;) 83.0018 Tj
0 -294.2942 Td
(4528   if\(f->type == FD_PIPE\)) 126.6869 Tj
0 -303.7875 Td
(4529     return pipewrite\(f->pipe, addr, n\);) 192.2146 Tj
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(4530   if\(f->type == FD_INODE\){) 135.4239 Tj
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(4531     ilock\(f->ip\);) 96.1073 Tj
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(4532     if\(\(r = writei\(f->ip, addr, f->off, n\)\) > 0\)) 231.5313 Tj
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(4533       f->off += r;) 100.4758 Tj
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(4534     iunlock\(f->ip\);) 104.8443 Tj
0 -360.7477 Td
(4535     return r;) 78.6333 Tj
0 -370.2411 Td
(4536   }) 34.9481 Tj
0 -379.7344 Td
(4537   panic\("filewrite"\);) 113.5814 Tj
0 -389.2278 Td
(4538 }) 26.2111 Tj
0 -398.7211 Td
(4539 ) 21.8426 Tj
0 -408.2145 Td
(4540 ) 21.8426 Tj
0 -417.7079 Td
(4541 ) 21.8426 Tj
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(4542 ) 21.8426 Tj
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(4543 ) 21.8426 Tj
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(4544 ) 21.8426 Tj
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(4545 ) 21.8426 Tj
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(4546 ) 21.8426 Tj
0 -474.668 Td
(4547 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/sysfile.c  Page 1) 174.7406 Tj
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(4550 #include "types.h") 100.4758 Tj
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(4551 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(4552 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(4553 #include "stat.h") 96.1073 Tj
0 -66.4535 Td
(4554 #include "mmu.h") 91.7388 Tj
0 -75.9469 Td
(4555 #include "proc.h") 96.1073 Tj
0 -85.4403 Td
(4556 #include "fs.h") 87.3703 Tj
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(4557 #include "fsvar.h") 100.4758 Tj
0 -104.427 Td
(4558 #include "file.h") 96.1073 Tj
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(4559 #include "fcntl.h") 100.4758 Tj
0 -123.4137 Td
(4560 ) 21.8426 Tj
0 -132.9071 Td
(4561 // Fetch the nth word-sized system call argument as a file\
 descriptor) 323.2701 Tj
0 -142.4004 Td
(4562 // and return both the descriptor and the corresponding st\
ruct file.) 318.9016 Tj
0 -151.8938 Td
(4563 static int) 65.5277 Tj
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(4564 argfd\(int n, int *pfd, struct file **pf\)) 196.5831 Tj
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(4565 {) 26.2111 Tj
0 -180.3739 Td
(4566   int fd;) 61.1592 Tj
0 -189.8672 Td
(4567   struct file *f;) 96.1073 Tj
0 -199.3606 Td
(4568 ) 21.8426 Tj
0 -208.8539 Td
(4569   if\(argint\(n, &fd\) < 0\)) 126.6869 Tj
0 -218.3473 Td
(4570     return -1;) 83.0018 Tj
0 -227.8407 Td
(4571   if\(fd < 0 || fd >= NOFILE || \(f=cp->ofile[fd]\) == 0\)) 257.7424 Tj
0 -237.334 Td
(4572     return -1;) 83.0018 Tj
0 -246.8274 Td
(4573   if\(pfd\)) 61.1592 Tj
0 -256.3207 Td
(4574     *pfd = fd;) 83.0018 Tj
0 -265.8141 Td
(4575   if\(pf\)) 56.7907 Tj
0 -275.3075 Td
(4576     *pf = f;) 74.2647 Tj
0 -284.8008 Td
(4577   return 0;) 69.8962 Tj
0 -294.2942 Td
(4578 }) 26.2111 Tj
0 -303.7875 Td
(4579 ) 21.8426 Tj
0 -313.2809 Td
(4580 // Allocate a file descriptor for the given file.) 235.8998 Tj
0 -322.7743 Td
(4581 // Takes over file reference from caller on success.) 249.0053 Tj
0 -332.2676 Td
(4582 static int) 65.5277 Tj
0 -341.761 Td
(4583 fdalloc\(struct file *f\)) 122.3184 Tj
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(4584 {) 26.2111 Tj
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(4585   int fd;) 61.1592 Tj
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(4586 ) 21.8426 Tj
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(4587   for\(fd = 0; fd < NOFILE; fd++\){) 166.0035 Tj
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(4588     if\(cp->ofile[fd] == 0\){) 139.7925 Tj
0 -398.7211 Td
(4589       cp->ofile[fd] = f;) 126.6869 Tj
0 -408.2145 Td
(4590       return fd;) 91.7388 Tj
0 -417.7079 Td
(4591     }) 43.6851 Tj
0 -427.2012 Td
(4592   }) 34.9481 Tj
0 -436.6946 Td
(4593   return -1;) 74.2647 Tj
0 -446.1879 Td
(4594 }) 26.2111 Tj
0 -455.6813 Td
(4595 ) 21.8426 Tj
0 -465.1747 Td
(4596 ) 21.8426 Tj
0 -474.668 Td
(4597 ) 21.8426 Tj
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(4598 ) 21.8426 Tj
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(4599 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/sysfile.c  Page 2) 174.7406 Tj
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(4601 sys_read\(void\)) 83.0018 Tj
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(4602 {) 26.2111 Tj
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(4603   struct file *f;) 96.1073 Tj
0 -66.4535 Td
(4604   int n;) 56.7907 Tj
0 -75.9469 Td
(4605   char *p;) 65.5277 Tj
0 -85.4403 Td
(4606 ) 21.8426 Tj
0 -94.9336 Td
(4607   if\(argfd\(0, 0, &f\) < 0 || argint\(2, &n\) < 0 || argp\
tr\(1, &p, n\) < 0\)) 327.6386 Tj
0 -104.427 Td
(4608     return -1;) 83.0018 Tj
0 -113.9203 Td
(4609   return fileread\(f, p, n\);) 139.7925 Tj
0 -123.4137 Td
(4610 }) 26.2111 Tj
0 -132.9071 Td
(4611 ) 21.8426 Tj
0 -142.4004 Td
(4612 int) 34.9481 Tj
0 -151.8938 Td
(4613 sys_write\(void\)) 87.3703 Tj
0 -161.3871 Td
(4614 {) 26.2111 Tj
0 -170.8805 Td
(4615   struct file *f;) 96.1073 Tj
0 -180.3739 Td
(4616   int n;) 56.7907 Tj
0 -189.8672 Td
(4617   char *p;) 65.5277 Tj
0 -199.3606 Td
(4618 ) 21.8426 Tj
0 -208.8539 Td
(4619   if\(argfd\(0, 0, &f\) < 0 || argint\(2, &n\) < 0 || argp\
tr\(1, &p, n\) < 0\)) 327.6386 Tj
0 -218.3473 Td
(4620     return -1;) 83.0018 Tj
0 -227.8407 Td
(4621   return filewrite\(f, p, n\);) 144.161 Tj
0 -237.334 Td
(4622 }) 26.2111 Tj
0 -246.8274 Td
(4623 ) 21.8426 Tj
0 -256.3207 Td
(4624 int) 34.9481 Tj
0 -265.8141 Td
(4625 sys_dup\(void\)) 78.6333 Tj
0 -275.3075 Td
(4626 {) 26.2111 Tj
0 -284.8008 Td
(4627   struct file *f;) 96.1073 Tj
0 -294.2942 Td
(4628   int fd;) 61.1592 Tj
0 -303.7875 Td
(4629 ) 21.8426 Tj
0 -313.2809 Td
(4630   if\(argfd\(0, 0, &f\) < 0\)) 131.0554 Tj
0 -322.7743 Td
(4631     return -1;) 83.0018 Tj
0 -332.2676 Td
(4632   if\(\(fd=fdalloc\(f\)\) < 0\)) 131.0554 Tj
0 -341.761 Td
(4633     return -1;) 83.0018 Tj
0 -351.2543 Td
(4634   filedup\(f\);) 78.6333 Tj
0 -360.7477 Td
(4635   return fd;) 74.2647 Tj
0 -370.2411 Td
(4636 }) 26.2111 Tj
0 -379.7344 Td
(4637 ) 21.8426 Tj
0 -389.2278 Td
(4638 int) 34.9481 Tj
0 -398.7211 Td
(4639 sys_close\(void\)) 87.3703 Tj
0 -408.2145 Td
(4640 {) 26.2111 Tj
0 -417.7079 Td
(4641   int fd;) 61.1592 Tj
0 -427.2012 Td
(4642   struct file *f;) 96.1073 Tj
0 -436.6946 Td
(4643 ) 21.8426 Tj
0 -446.1879 Td
(4644   if\(argfd\(0, &fd, &f\) < 0\)) 139.7925 Tj
0 -455.6813 Td
(4645     return -1;) 83.0018 Tj
0 -465.1747 Td
(4646   cp->ofile[fd] = 0;) 109.2129 Tj
0 -474.668 Td
(4647   fileclose\(f\);) 87.3703 Tj
0 -484.1614 Td
(4648   return 0;) 69.8962 Tj
0 -493.6547 Td
(4649 }) 26.2111 Tj
0 -522.1348 Td
(Sheet 46) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysfile.c  Page 3) 174.7406 Tj
0 -28.4801 Td
(4650 int) 34.9481 Tj
0 -37.9735 Td
(4651 sys_fstat\(void\)) 87.3703 Tj
0 -47.4668 Td
(4652 {) 26.2111 Tj
0 -56.9602 Td
(4653   struct file *f;) 96.1073 Tj
0 -66.4535 Td
(4654   struct stat *st;) 100.4758 Tj
0 -75.9469 Td
(4655 ) 21.8426 Tj
0 -85.4403 Td
(4656   if\(argfd\(0, 0, &f\) < 0 || argptr\(1, \(void*\)&st, si\
zeof\(*st\)\) < 0\)) 314.533 Tj
0 -94.9336 Td
(4657     return -1;) 83.0018 Tj
0 -104.427 Td
(4658   return filestat\(f, st\);) 131.0554 Tj
0 -113.9203 Td
(4659 }) 26.2111 Tj
0 -123.4137 Td
(4660 ) 21.8426 Tj
0 -132.9071 Td
(4661 // Create the path new as a link to the same inode as old.) 275.2164 Tj
0 -142.4004 Td
(4662 int) 34.9481 Tj
0 -151.8938 Td
(4663 sys_link\(void\)) 83.0018 Tj
0 -161.3871 Td
(4664 {) 26.2111 Tj
0 -170.8805 Td
(4665   char name[DIRSIZ], *new, *old;) 161.635 Tj
0 -180.3739 Td
(4666   struct inode *dp, *ip;) 126.6869 Tj
0 -189.8672 Td
(4667 ) 21.8426 Tj
0 -199.3606 Td
(4668   if\(argstr\(0, &old\) < 0 || argstr\(1, &new\) < 0\)) 231.5313 Tj
0 -208.8539 Td
(4669     return -1;) 83.0018 Tj
0 -218.3473 Td
(4670   if\(\(ip = namei\(old\)\) == 0\)) 144.161 Tj
0 -227.8407 Td
(4671     return -1;) 83.0018 Tj
0 -237.334 Td
(4672   ilock\(ip\);) 74.2647 Tj
0 -246.8274 Td
(4673   if\(ip->type == T_DIR\){) 126.6869 Tj
0 -256.3207 Td
(4674     iunlockput\(ip\);) 104.8443 Tj
0 -265.8141 Td
(4675     return -1;) 83.0018 Tj
0 -275.3075 Td
(4676   }) 34.9481 Tj
0 -284.8008 Td
(4677   ip->nlink++;) 83.0018 Tj
0 -294.2942 Td
(4678   iupdate\(ip\);) 83.0018 Tj
0 -303.7875 Td
(4679   iunlock\(ip\);) 83.0018 Tj
0 -313.2809 Td
(4680 ) 21.8426 Tj
0 -322.7743 Td
(4681   if\(\(dp = nameiparent\(new, name\)\) == 0\)) 196.5831 Tj
0 -332.2676 Td
(4682     goto  bad;) 83.0018 Tj
0 -341.761 Td
(4683   ilock\(dp\);) 74.2647 Tj
0 -351.2543 Td
(4684   if\(dp->dev != ip->dev || dirlink\(dp, name, ip->inum\) \
< 0\)) 279.5849 Tj
0 -360.7477 Td
(4685     goto bad;) 78.6333 Tj
0 -370.2411 Td
(4686   iunlockput\(dp\);) 96.1073 Tj
0 -379.7344 Td
(4687   iput\(ip\);) 69.8962 Tj
0 -389.2278 Td
(4688   return 0;) 69.8962 Tj
0 -398.7211 Td
(4689 ) 21.8426 Tj
0 -408.2145 Td
(4690 bad:) 39.3166 Tj
0 -417.7079 Td
(4691   if\(dp\)) 56.7907 Tj
0 -427.2012 Td
(4692     iunlockput\(dp\);) 104.8443 Tj
0 -436.6946 Td
(4693   ilock\(ip\);) 74.2647 Tj
0 -446.1879 Td
(4694   ip->nlink--;) 83.0018 Tj
0 -455.6813 Td
(4695   iupdate\(ip\);) 83.0018 Tj
0 -465.1747 Td
(4696   iunlockput\(ip\);) 96.1073 Tj
0 -474.668 Td
(4697   return -1;) 74.2647 Tj
0 -484.1614 Td
(4698 }) 26.2111 Tj
0 -493.6547 Td
(4699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 46) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 54 54
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysfile.c  Page 4) 174.7406 Tj
0 -28.4801 Td
(4700 // Is the directory dp empty except for "." and ".." ?) 257.7424 Tj
0 -37.9735 Td
(4701 static int) 65.5277 Tj
0 -47.4668 Td
(4702 isdirempty\(struct inode *dp\)) 144.161 Tj
0 -56.9602 Td
(4703 {) 26.2111 Tj
0 -66.4535 Td
(4704   int off;) 65.5277 Tj
0 -75.9469 Td
(4705   struct dirent de;) 104.8443 Tj
0 -85.4403 Td
(4706 ) 21.8426 Tj
0 -94.9336 Td
(4707   for\(off=2*sizeof\(de\); off<dp->size; off+=sizeof\(de\)\
\){) 262.1109 Tj
0 -104.427 Td
(4708     if\(readi\(dp, \(char*\)&de, off, sizeof\(de\)\) != si\
zeof\(de\)\)) 283.9534 Tj
0 -113.9203 Td
(4709       panic\("isdirempty: readi"\);) 166.0035 Tj
0 -123.4137 Td
(4710     if\(de.inum != 0\)) 109.2129 Tj
0 -132.9071 Td
(4711       return 0;) 87.3703 Tj
0 -142.4004 Td
(4712   }) 34.9481 Tj
0 -151.8938 Td
(4713   return 1;) 69.8962 Tj
0 -161.3871 Td
(4714 }) 26.2111 Tj
0 -170.8805 Td
(4715 ) 21.8426 Tj
0 -180.3739 Td
(4716 ) 21.8426 Tj
0 -189.8672 Td
(4717 ) 21.8426 Tj
0 -199.3606 Td
(4718 ) 21.8426 Tj
0 -208.8539 Td
(4719 ) 21.8426 Tj
0 -218.3473 Td
(4720 ) 21.8426 Tj
0 -227.8407 Td
(4721 ) 21.8426 Tj
0 -237.334 Td
(4722 ) 21.8426 Tj
0 -246.8274 Td
(4723 ) 21.8426 Tj
0 -256.3207 Td
(4724 ) 21.8426 Tj
0 -265.8141 Td
(4725 ) 21.8426 Tj
0 -275.3075 Td
(4726 ) 21.8426 Tj
0 -284.8008 Td
(4727 ) 21.8426 Tj
0 -294.2942 Td
(4728 ) 21.8426 Tj
0 -303.7875 Td
(4729 ) 21.8426 Tj
0 -313.2809 Td
(4730 ) 21.8426 Tj
0 -322.7743 Td
(4731 ) 21.8426 Tj
0 -332.2676 Td
(4732 ) 21.8426 Tj
0 -341.761 Td
(4733 ) 21.8426 Tj
0 -351.2543 Td
(4734 ) 21.8426 Tj
0 -360.7477 Td
(4735 ) 21.8426 Tj
0 -370.2411 Td
(4736 ) 21.8426 Tj
0 -379.7344 Td
(4737 ) 21.8426 Tj
0 -389.2278 Td
(4738 ) 21.8426 Tj
0 -398.7211 Td
(4739 ) 21.8426 Tj
0 -408.2145 Td
(4740 ) 21.8426 Tj
0 -417.7079 Td
(4741 ) 21.8426 Tj
0 -427.2012 Td
(4742 ) 21.8426 Tj
0 -436.6946 Td
(4743 ) 21.8426 Tj
0 -446.1879 Td
(4744 ) 21.8426 Tj
0 -455.6813 Td
(4745 ) 21.8426 Tj
0 -465.1747 Td
(4746 ) 21.8426 Tj
0 -474.668 Td
(4747 ) 21.8426 Tj
0 -484.1614 Td
(4748 ) 21.8426 Tj
0 -493.6547 Td
(4749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 47) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysfile.c  Page 5) 174.7406 Tj
0 -28.4801 Td
(4750 int) 34.9481 Tj
0 -37.9735 Td
(4751 sys_unlink\(void\)) 91.7388 Tj
0 -47.4668 Td
(4752 {) 26.2111 Tj
0 -56.9602 Td
(4753   struct inode *ip, *dp;) 126.6869 Tj
0 -66.4535 Td
(4754   struct dirent de;) 104.8443 Tj
0 -75.9469 Td
(4755   char name[DIRSIZ], *path;) 139.7925 Tj
0 -85.4403 Td
(4756   uint off;) 69.8962 Tj
0 -94.9336 Td
(4757 ) 21.8426 Tj
0 -104.427 Td
(4758   if\(argstr\(0, &path\) < 0\)) 135.4239 Tj
0 -113.9203 Td
(4759     return -1;) 83.0018 Tj
0 -123.4137 Td
(4760   if\(\(dp = nameiparent\(path, name\)\) == 0\)) 200.9517 Tj
0 -132.9071 Td
(4761     return -1;) 83.0018 Tj
0 -142.4004 Td
(4762   ilock\(dp\);) 74.2647 Tj
0 -151.8938 Td
(4763 ) 21.8426 Tj
0 -161.3871 Td
(4764   // Cannot unlink "." or "..".) 157.2665 Tj
0 -170.8805 Td
(4765   if\(namecmp\(name, "."\) == 0 || namecmp\(name, ".."\) =\
= 0\){) 275.2164 Tj
0 -180.3739 Td
(4766     iunlockput\(dp\);) 104.8443 Tj
0 -189.8672 Td
(4767     return -1;) 83.0018 Tj
0 -199.3606 Td
(4768   }) 34.9481 Tj
0 -208.8539 Td
(4769 ) 21.8426 Tj
0 -218.3473 Td
(4770   if\(\(ip = dirlookup\(dp, name, &off\)\) == 0\){) 214.0572 Tj
0 -227.8407 Td
(4771     iunlockput\(dp\);) 104.8443 Tj
0 -237.334 Td
(4772     return -1;) 83.0018 Tj
0 -246.8274 Td
(4773   }) 34.9481 Tj
0 -256.3207 Td
(4774   ilock\(ip\);) 74.2647 Tj
0 -265.8141 Td
(4775 ) 21.8426 Tj
0 -275.3075 Td
(4776   if\(ip->nlink < 1\)) 104.8443 Tj
0 -284.8008 Td
(4777     panic\("unlink: nlink < 1"\);) 157.2665 Tj
0 -294.2942 Td
(4778   if\(ip->type == T_DIR && !isdirempty\(ip\)\){) 209.6887 Tj
0 -303.7875 Td
(4779     iunlockput\(ip\);) 104.8443 Tj
0 -313.2809 Td
(4780     iunlockput\(dp\);) 104.8443 Tj
0 -322.7743 Td
(4781     return -1;) 83.0018 Tj
0 -332.2676 Td
(4782   }) 34.9481 Tj
0 -341.761 Td
(4783 ) 21.8426 Tj
0 -351.2543 Td
(4784   memset\(&de, 0, sizeof\(de\)\);) 148.5295 Tj
0 -360.7477 Td
(4785   if\(writei\(dp, \(char*\)&de, off, sizeof\(de\)\) != siz\
eof\(de\)\)) 279.5849 Tj
0 -370.2411 Td
(4786     panic\("unlink: writei"\);) 144.161 Tj
0 -379.7344 Td
(4787   iunlockput\(dp\);) 96.1073 Tj
0 -389.2278 Td
(4788 ) 21.8426 Tj
0 -398.7211 Td
(4789   ip->nlink--;) 83.0018 Tj
0 -408.2145 Td
(4790   iupdate\(ip\);) 83.0018 Tj
0 -417.7079 Td
(4791   iunlockput\(ip\);) 96.1073 Tj
0 -427.2012 Td
(4792   return 0;) 69.8962 Tj
0 -436.6946 Td
(4793 }) 26.2111 Tj
0 -446.1879 Td
(4794 ) 21.8426 Tj
0 -455.6813 Td
(4795 ) 21.8426 Tj
0 -465.1747 Td
(4796 ) 21.8426 Tj
0 -474.668 Td
(4797 ) 21.8426 Tj
0 -484.1614 Td
(4798 ) 21.8426 Tj
0 -493.6547 Td
(4799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 47) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 55 55
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysfile.c  Page 6) 174.7406 Tj
0 -28.4801 Td
(4800 static struct inode*) 109.2129 Tj
0 -37.9735 Td
(4801 create\(char *path, int canexist, short type, short major,\
 short minor\)) 327.6386 Tj
0 -47.4668 Td
(4802 {) 26.2111 Tj
0 -56.9602 Td
(4803   uint off;) 69.8962 Tj
0 -66.4535 Td
(4804   struct inode *ip, *dp;) 126.6869 Tj
0 -75.9469 Td
(4805   char name[DIRSIZ];) 109.2129 Tj
0 -85.4403 Td
(4806 ) 21.8426 Tj
0 -94.9336 Td
(4807   if\(\(dp = nameiparent\(path, name\)\) == 0\)) 200.9517 Tj
0 -104.427 Td
(4808     return 0;) 78.6333 Tj
0 -113.9203 Td
(4809   ilock\(dp\);) 74.2647 Tj
0 -123.4137 Td
(4810 ) 21.8426 Tj
0 -132.9071 Td
(4811   if\(canexist && \(ip = dirlookup\(dp, name, &off\)\) != \
0\){) 266.4794 Tj
0 -142.4004 Td
(4812     iunlockput\(dp\);) 104.8443 Tj
0 -151.8938 Td
(4813     ilock\(ip\);) 83.0018 Tj
0 -161.3871 Td
(4814     if\(ip->type != type || ip->major != major || ip->mino\
r != minor\){) 323.2701 Tj
0 -170.8805 Td
(4815       iunlockput\(ip\);) 113.5814 Tj
0 -180.3739 Td
(4816       return 0;) 87.3703 Tj
0 -189.8672 Td
(4817     }) 43.6851 Tj
0 -199.3606 Td
(4818     return ip;) 83.0018 Tj
0 -208.8539 Td
(4819   }) 34.9481 Tj
0 -218.3473 Td
(4820 ) 21.8426 Tj
0 -227.8407 Td
(4821   if\(\(ip = ialloc\(dp->dev, type\)\) == 0\){) 196.5831 Tj
0 -237.334 Td
(4822     iunlockput\(dp\);) 104.8443 Tj
0 -246.8274 Td
(4823     return 0;) 78.6333 Tj
0 -256.3207 Td
(4824   }) 34.9481 Tj
0 -265.8141 Td
(4825   ilock\(ip\);) 74.2647 Tj
0 -275.3075 Td
(4826   ip->major = major;) 109.2129 Tj
0 -284.8008 Td
(4827   ip->minor = minor;) 109.2129 Tj
0 -294.2942 Td
(4828   ip->nlink = 1;) 91.7388 Tj
0 -303.7875 Td
(4829   iupdate\(ip\);) 83.0018 Tj
0 -313.2809 Td
(4830 ) 21.8426 Tj
0 -322.7743 Td
(4831   if\(dirlink\(dp, name, ip->inum\) < 0\){) 187.8461 Tj
0 -332.2676 Td
(4832     ip->nlink = 0;) 100.4758 Tj
0 -341.761 Td
(4833     iunlockput\(ip\);) 104.8443 Tj
0 -351.2543 Td
(4834     iunlockput\(dp\);) 104.8443 Tj
0 -360.7477 Td
(4835     return 0;) 78.6333 Tj
0 -370.2411 Td
(4836   }) 34.9481 Tj
0 -379.7344 Td
(4837 ) 21.8426 Tj
0 -389.2278 Td
(4838   if\(type == T_DIR\){  // Create . and .. entries.) 235.8998 Tj
0 -398.7211 Td
(4839     dp->nlink++;  // for "..") 148.5295 Tj
0 -408.2145 Td
(4840     iupdate\(dp\);) 91.7388 Tj
0 -417.7079 Td
(4841     // No ip->nlink++ for ".": avoid cyclic ref count.) 257.7424 Tj
0 -427.2012 Td
(4842     if\(dirlink\(ip, ".", ip->inum\) < 0 || dirlink\(ip, "\
..", dp->inum\) < 0\)) 340.7441 Tj
0 -436.6946 Td
(4843       panic\("create dots"\);) 139.7925 Tj
0 -446.1879 Td
(4844   }) 34.9481 Tj
0 -455.6813 Td
(4845   iunlockput\(dp\);) 96.1073 Tj
0 -465.1747 Td
(4846   return ip;) 74.2647 Tj
0 -474.668 Td
(4847 }) 26.2111 Tj
0 -484.1614 Td
(4848 ) 21.8426 Tj
0 -493.6547 Td
(4849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 48) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysfile.c  Page 7) 174.7406 Tj
0 -28.4801 Td
(4850 int) 34.9481 Tj
0 -37.9735 Td
(4851 sys_open\(void\)) 83.0018 Tj
0 -47.4668 Td
(4852 {) 26.2111 Tj
0 -56.9602 Td
(4853   char *path;) 78.6333 Tj
0 -66.4535 Td
(4854   int fd, omode;) 91.7388 Tj
0 -75.9469 Td
(4855   struct file *f;) 96.1073 Tj
0 -85.4403 Td
(4856   struct inode *ip;) 104.8443 Tj
0 -94.9336 Td
(4857 ) 21.8426 Tj
0 -104.427 Td
(4858   if\(argstr\(0, &path\) < 0 || argint\(1, &omode\) < 0\)) 244.6368 Tj
0 -113.9203 Td
(4859     return -1;) 83.0018 Tj
0 -123.4137 Td
(4860 ) 21.8426 Tj
0 -132.9071 Td
(4861   if\(omode & O_CREATE\){) 122.3184 Tj
0 -142.4004 Td
(4862     if\(\(ip = create\(path, 1, T_FILE, 0, 0\)\) == 0\)) 235.8998 Tj
0 -151.8938 Td
(4863       return -1;) 91.7388 Tj
0 -161.3871 Td
(4864   } else {) 65.5277 Tj
0 -170.8805 Td
(4865     if\(\(ip = namei\(path\)\) == 0\)) 157.2665 Tj
0 -180.3739 Td
(4866       return -1;) 91.7388 Tj
0 -189.8672 Td
(4867     ilock\(ip\);) 83.0018 Tj
0 -199.3606 Td
(4868     if\(ip->type == T_DIR && \(omode & \(O_RDWR|O_WRONLY\)\
\)\){) 270.8479 Tj
0 -208.8539 Td
(4869       iunlockput\(ip\);) 113.5814 Tj
0 -218.3473 Td
(4870       return -1;) 91.7388 Tj
0 -227.8407 Td
(4871     }) 43.6851 Tj
0 -237.334 Td
(4872   }) 34.9481 Tj
0 -246.8274 Td
(4873 ) 21.8426 Tj
0 -256.3207 Td
(4874   if\(\(f = filealloc\(\)\) == 0 || \(fd = fdalloc\(f\)\) \
< 0\){) 257.7424 Tj
0 -265.8141 Td
(4875     if\(f\)) 61.1592 Tj
0 -275.3075 Td
(4876       fileclose\(f\);) 104.8443 Tj
0 -284.8008 Td
(4877     iunlockput\(ip\);) 104.8443 Tj
0 -294.2942 Td
(4878     return -1;) 83.0018 Tj
0 -303.7875 Td
(4879   }) 34.9481 Tj
0 -313.2809 Td
(4880   iunlock\(ip\);) 83.0018 Tj
0 -322.7743 Td
(4881 ) 21.8426 Tj
0 -332.2676 Td
(4882   f->type = FD_INODE;) 113.5814 Tj
0 -341.761 Td
(4883   f->ip = ip;) 78.6333 Tj
0 -351.2543 Td
(4884   f->off = 0;) 78.6333 Tj
0 -360.7477 Td
(4885   f->readable = !\(omode & O_WRONLY\);) 179.1091 Tj
0 -370.2411 Td
(4886   f->writable = \(omode & O_WRONLY\) || \(omode & O_RDWR\)\
;) 262.1109 Tj
0 -379.7344 Td
(4887 ) 21.8426 Tj
0 -389.2278 Td
(4888   return fd;) 74.2647 Tj
0 -398.7211 Td
(4889 }) 26.2111 Tj
0 -408.2145 Td
(4890 ) 21.8426 Tj
0 -417.7079 Td
(4891 ) 21.8426 Tj
0 -427.2012 Td
(4892 ) 21.8426 Tj
0 -436.6946 Td
(4893 ) 21.8426 Tj
0 -446.1879 Td
(4894 ) 21.8426 Tj
0 -455.6813 Td
(4895 ) 21.8426 Tj
0 -465.1747 Td
(4896 ) 21.8426 Tj
0 -474.668 Td
(4897 ) 21.8426 Tj
0 -484.1614 Td
(4898 ) 21.8426 Tj
0 -493.6547 Td
(4899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 48) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 56 56
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysfile.c  Page 8) 174.7406 Tj
0 -28.4801 Td
(4900 int) 34.9481 Tj
0 -37.9735 Td
(4901 sys_mknod\(void\)) 87.3703 Tj
0 -47.4668 Td
(4902 {) 26.2111 Tj
0 -56.9602 Td
(4903   struct inode *ip;) 104.8443 Tj
0 -66.4535 Td
(4904   char *path;) 78.6333 Tj
0 -75.9469 Td
(4905   int len;) 65.5277 Tj
0 -85.4403 Td
(4906   int major, minor;) 104.8443 Tj
0 -94.9336 Td
(4907 ) 21.8426 Tj
0 -104.427 Td
(4908   if\(\(len=argstr\(0, &path\)\) < 0 ||) 170.3721 Tj
0 -113.9203 Td
(4909      argint\(1, &major\) < 0 ||) 148.5295 Tj
0 -123.4137 Td
(4910      argint\(2, &minor\) < 0 ||) 148.5295 Tj
0 -132.9071 Td
(4911      \(ip = create\(path, 0, T_DEV, major, minor\)\) == 0\)) 257.7424 Tj
0 -142.4004 Td
(4912     return -1;) 83.0018 Tj
0 -151.8938 Td
(4913   iunlockput\(ip\);) 96.1073 Tj
0 -161.3871 Td
(4914   return 0;) 69.8962 Tj
0 -170.8805 Td
(4915 }) 26.2111 Tj
0 -180.3739 Td
(4916 ) 21.8426 Tj
0 -189.8672 Td
(4917 int) 34.9481 Tj
0 -199.3606 Td
(4918 sys_mkdir\(void\)) 87.3703 Tj
0 -208.8539 Td
(4919 {) 26.2111 Tj
0 -218.3473 Td
(4920   char *path;) 78.6333 Tj
0 -227.8407 Td
(4921   struct inode *ip;) 104.8443 Tj
0 -237.334 Td
(4922 ) 21.8426 Tj
0 -246.8274 Td
(4923   if\(argstr\(0, &path\) < 0 || \(ip = create\(path, 0, T_\
DIR, 0, 0\)\) == 0\)) 327.6386 Tj
0 -256.3207 Td
(4924     return -1;) 83.0018 Tj
0 -265.8141 Td
(4925   iunlockput\(ip\);) 96.1073 Tj
0 -275.3075 Td
(4926   return 0;) 69.8962 Tj
0 -284.8008 Td
(4927 }) 26.2111 Tj
0 -294.2942 Td
(4928 ) 21.8426 Tj
0 -303.7875 Td
(4929 int) 34.9481 Tj
0 -313.2809 Td
(4930 sys_chdir\(void\)) 87.3703 Tj
0 -322.7743 Td
(4931 {) 26.2111 Tj
0 -332.2676 Td
(4932   char *path;) 78.6333 Tj
0 -341.761 Td
(4933   struct inode *ip;) 104.8443 Tj
0 -351.2543 Td
(4934 ) 21.8426 Tj
0 -360.7477 Td
(4935   if\(argstr\(0, &path\) < 0 || \(ip = namei\(path\)\) == \
0\)) 253.3738 Tj
0 -370.2411 Td
(4936     return -1;) 83.0018 Tj
0 -379.7344 Td
(4937   ilock\(ip\);) 74.2647 Tj
0 -389.2278 Td
(4938   if\(ip->type != T_DIR\){) 126.6869 Tj
0 -398.7211 Td
(4939     iunlockput\(ip\);) 104.8443 Tj
0 -408.2145 Td
(4940     return -1;) 83.0018 Tj
0 -417.7079 Td
(4941   }) 34.9481 Tj
0 -427.2012 Td
(4942   iunlock\(ip\);) 83.0018 Tj
0 -436.6946 Td
(4943   iput\(cp->cwd\);) 91.7388 Tj
0 -446.1879 Td
(4944   cp->cwd = ip;) 87.3703 Tj
0 -455.6813 Td
(4945   return 0;) 69.8962 Tj
0 -465.1747 Td
(4946 }) 26.2111 Tj
0 -474.668 Td
(4947 ) 21.8426 Tj
0 -484.1614 Td
(4948 ) 21.8426 Tj
0 -493.6547 Td
(4949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 49) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sysfile.c  Page 9) 174.7406 Tj
0 -28.4801 Td
(4950 int) 34.9481 Tj
0 -37.9735 Td
(4951 sys_exec\(void\)) 83.0018 Tj
0 -47.4668 Td
(4952 {) 26.2111 Tj
0 -56.9602 Td
(4953   char *path, *argv[20];) 126.6869 Tj
0 -66.4535 Td
(4954   int i;) 56.7907 Tj
0 -75.9469 Td
(4955   uint uargv, uarg;) 104.8443 Tj
0 -85.4403 Td
(4956 ) 21.8426 Tj
0 -94.9336 Td
(4957   if\(argstr\(0, &path\) < 0 || argint\(1, \(int*\)&uargv\)\
 < 0\)) 270.8479 Tj
0 -104.427 Td
(4958     return -1;) 83.0018 Tj
0 -113.9203 Td
(4959   memset\(argv, 0, sizeof\(argv\)\);) 161.635 Tj
0 -123.4137 Td
(4960   for\(i=0;; i++\){) 96.1073 Tj
0 -132.9071 Td
(4961     if\(i >= NELEM\(argv\)\)) 126.6869 Tj
0 -142.4004 Td
(4962       return -1;) 91.7388 Tj
0 -151.8938 Td
(4963     if\(fetchint\(cp, uargv+4*i, \(int*\)&uarg\) < 0\)) 231.5313 Tj
0 -161.3871 Td
(4964       return -1;) 91.7388 Tj
0 -170.8805 Td
(4965     if\(uarg == 0\){) 100.4758 Tj
0 -180.3739 Td
(4966       argv[i] = 0;) 100.4758 Tj
0 -189.8672 Td
(4967       break;) 74.2647 Tj
0 -199.3606 Td
(4968     }) 43.6851 Tj
0 -208.8539 Td
(4969     if\(fetchstr\(cp, uarg, &argv[i]\) < 0\)) 196.5831 Tj
0 -218.3473 Td
(4970       return -1;) 91.7388 Tj
0 -227.8407 Td
(4971   }) 34.9481 Tj
0 -237.334 Td
(4972   return exec\(path, argv\);) 135.4239 Tj
0 -246.8274 Td
(4973 }) 26.2111 Tj
0 -256.3207 Td
(4974 ) 21.8426 Tj
0 -265.8141 Td
(4975 int) 34.9481 Tj
0 -275.3075 Td
(4976 sys_pipe\(void\)) 83.0018 Tj
0 -284.8008 Td
(4977 {) 26.2111 Tj
0 -294.2942 Td
(4978   int *fd;) 65.5277 Tj
0 -303.7875 Td
(4979   struct file *rf, *wf;) 122.3184 Tj
0 -313.2809 Td
(4980   int fd0, fd1;) 87.3703 Tj
0 -322.7743 Td
(4981 ) 21.8426 Tj
0 -332.2676 Td
(4982   if\(argptr\(0, \(void*\)&fd, 2*sizeof\(fd[0]\)\) < 0\)) 231.5313 Tj
0 -341.761 Td
(4983     return -1;) 83.0018 Tj
0 -351.2543 Td
(4984   if\(pipealloc\(&rf, &wf\) < 0\)) 148.5295 Tj
0 -360.7477 Td
(4985     return -1;) 83.0018 Tj
0 -370.2411 Td
(4986   fd0 = -1;) 69.8962 Tj
0 -379.7344 Td
(4987   if\(\(fd0 = fdalloc\(rf\)\) < 0 || \(fd1 = fdalloc\(wf\)\
\) < 0\){) 270.8479 Tj
0 -389.2278 Td
(4988     if\(fd0 >= 0\)) 91.7388 Tj
0 -398.7211 Td
(4989       cp->ofile[fd0] = 0;) 131.0554 Tj
0 -408.2145 Td
(4990     fileclose\(rf\);) 100.4758 Tj
0 -417.7079 Td
(4991     fileclose\(wf\);) 100.4758 Tj
0 -427.2012 Td
(4992     return -1;) 83.0018 Tj
0 -436.6946 Td
(4993   }) 34.9481 Tj
0 -446.1879 Td
(4994   fd[0] = fd0;) 83.0018 Tj
0 -455.6813 Td
(4995   fd[1] = fd1;) 83.0018 Tj
0 -465.1747 Td
(4996   return 0;) 69.8962 Tj
0 -474.668 Td
(4997 }) 26.2111 Tj
0 -484.1614 Td
(4998 ) 21.8426 Tj
0 -493.6547 Td
(4999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 49) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 57 57
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/exec.c  Page 1) 161.635 Tj
0 -28.4801 Td
(5000 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(5001 #include "param.h") 100.4758 Tj
0 -47.4668 Td
(5002 #include "mmu.h") 91.7388 Tj
0 -56.9602 Td
(5003 #include "proc.h") 96.1073 Tj
0 -66.4535 Td
(5004 #include "defs.h") 96.1073 Tj
0 -75.9469 Td
(5005 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(5006 #include "elf.h") 91.7388 Tj
0 -94.9336 Td
(5007 ) 21.8426 Tj
0 -104.427 Td
(5008 int) 34.9481 Tj
0 -113.9203 Td
(5009 exec\(char *path, char **argv\)) 148.5295 Tj
0 -123.4137 Td
(5010 {) 26.2111 Tj
0 -132.9071 Td
(5011   char *mem, *s, *last;) 122.3184 Tj
0 -142.4004 Td
(5012   int i, argc, arglen, len, off;) 161.635 Tj
0 -151.8938 Td
(5013   uint sz, sp, argp;) 109.2129 Tj
0 -161.3871 Td
(5014   struct elfhdr elf;) 109.2129 Tj
0 -170.8805 Td
(5015   struct inode *ip;) 104.8443 Tj
0 -180.3739 Td
(5016   struct proghdr ph;) 109.2129 Tj
0 -189.8672 Td
(5017 ) 21.8426 Tj
0 -199.3606 Td
(5018   if\(\(ip = namei\(path\)\) == 0\)) 148.5295 Tj
0 -208.8539 Td
(5019     return -1;) 83.0018 Tj
0 -218.3473 Td
(5020   ilock\(ip\);) 74.2647 Tj
0 -227.8407 Td
(5021 ) 21.8426 Tj
0 -237.334 Td
(5022   // Compute memory size of new process.) 196.5831 Tj
0 -246.8274 Td
(5023   mem = 0;) 65.5277 Tj
0 -256.3207 Td
(5024   sz = 0;) 61.1592 Tj
0 -265.8141 Td
(5025 ) 21.8426 Tj
0 -275.3075 Td
(5026   // Program segments.) 117.9499 Tj
0 -284.8008 Td
(5027   if\(readi\(ip, \(char*\)&elf, 0, sizeof\(elf\)\) < sizeo\
f\(elf\)\)) 275.2164 Tj
0 -294.2942 Td
(5028     goto bad;) 78.6333 Tj
0 -303.7875 Td
(5029   if\(elf.magic != ELF_MAGIC\)) 144.161 Tj
0 -313.2809 Td
(5030     goto bad;) 78.6333 Tj
0 -322.7743 Td
(5031   for\(i=0, off=elf.phoff; i<elf.phnum; i++, off+=sizeof\(\
ph\)\){) 288.322 Tj
0 -332.2676 Td
(5032     if\(readi\(ip, \(char*\)&ph, off, sizeof\(ph\)\) != si\
zeof\(ph\)\)) 283.9534 Tj
0 -341.761 Td
(5033       goto bad;) 87.3703 Tj
0 -351.2543 Td
(5034     if\(ph.type != ELF_PROG_LOAD\)) 161.635 Tj
0 -360.7477 Td
(5035       continue;) 87.3703 Tj
0 -370.2411 Td
(5036     if\(ph.memsz < ph.filesz\)) 144.161 Tj
0 -379.7344 Td
(5037       goto bad;) 87.3703 Tj
0 -389.2278 Td
(5038     sz += ph.memsz;) 104.8443 Tj
0 -398.7211 Td
(5039   }) 34.9481 Tj
0 -408.2145 Td
(5040 ) 21.8426 Tj
0 -417.7079 Td
(5041   // Arguments.) 87.3703 Tj
0 -427.2012 Td
(5042   arglen = 0;) 78.6333 Tj
0 -436.6946 Td
(5043   for\(argc=0; argv[argc]; argc++\)) 166.0035 Tj
0 -446.1879 Td
(5044     arglen += strlen\(argv[argc]\) + 1;) 183.4776 Tj
0 -455.6813 Td
(5045   arglen = \(arglen+3\) & ~3;) 139.7925 Tj
0 -465.1747 Td
(5046   sz += arglen + 4*\(argc+1\);) 144.161 Tj
0 -474.668 Td
(5047 ) 21.8426 Tj
0 -484.1614 Td
(5048   // Stack.) 69.8962 Tj
0 -493.6547 Td
(5049   sz += PAGE;) 78.6333 Tj
0 -522.1348 Td
(Sheet 50) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/exec.c  Page 2) 161.635 Tj
0 -28.4801 Td
(5050   // Allocate program memory.) 148.5295 Tj
0 -37.9735 Td
(5051   sz = \(sz+PAGE-1\) & ~\(PAGE-1\);) 157.2665 Tj
0 -47.4668 Td
(5052   mem = kalloc\(sz\);) 104.8443 Tj
0 -56.9602 Td
(5053   if\(mem == 0\)) 83.0018 Tj
0 -66.4535 Td
(5054     goto bad;) 78.6333 Tj
0 -75.9469 Td
(5055   memset\(mem, 0, sz\);) 113.5814 Tj
0 -85.4403 Td
(5056 ) 21.8426 Tj
0 -94.9336 Td
(5057   // Load program into memory.) 152.898 Tj
0 -104.427 Td
(5058   for\(i=0, off=elf.phoff; i<elf.phnum; i++, off+=sizeof\(\
ph\)\){) 288.322 Tj
0 -113.9203 Td
(5059     if\(readi\(ip, \(char*\)&ph, off, sizeof\(ph\)\) != si\
zeof\(ph\)\)) 283.9534 Tj
0 -123.4137 Td
(5060       goto bad;) 87.3703 Tj
0 -132.9071 Td
(5061     if\(ph.type != ELF_PROG_LOAD\)) 161.635 Tj
0 -142.4004 Td
(5062       continue;) 87.3703 Tj
0 -151.8938 Td
(5063     if\(ph.va + ph.memsz > sz\)) 148.5295 Tj
0 -161.3871 Td
(5064       goto bad;) 87.3703 Tj
0 -170.8805 Td
(5065     if\(readi\(ip, mem + ph.va, ph.offset, ph.filesz\) != \
ph.filesz\)) 305.796 Tj
0 -180.3739 Td
(5066       goto bad;) 87.3703 Tj
0 -189.8672 Td
(5067     memset\(mem + ph.va + ph.filesz, 0, ph.memsz - ph.file\
sz\);) 288.322 Tj
0 -199.3606 Td
(5068   }) 34.9481 Tj
0 -208.8539 Td
(5069   iunlockput\(ip\);) 96.1073 Tj
0 -218.3473 Td
(5070 ) 21.8426 Tj
0 -227.8407 Td
(5071   // Initialize stack.) 117.9499 Tj
0 -237.334 Td
(5072   sp = sz;) 65.5277 Tj
0 -246.8274 Td
(5073   argp = sz - arglen - 4*\(argc+1\);) 170.3721 Tj
0 -256.3207 Td
(5074 ) 21.8426 Tj
0 -265.8141 Td
(5075   // Copy argv strings and pointers to stack.) 218.4257 Tj
0 -275.3075 Td
(5076   *\(uint*\)\(mem+argp + 4*argc\) = 0;  // argv[argc]) 235.8998 Tj
0 -284.8008 Td
(5077   for\(i=argc-1; i>=0; i--\){) 139.7925 Tj
0 -294.2942 Td
(5078     len = strlen\(argv[i]\) + 1;) 152.898 Tj
0 -303.7875 Td
(5079     sp -= len;) 83.0018 Tj
0 -313.2809 Td
(5080     memmove\(mem+sp, argv[i], len\);) 170.3721 Tj
0 -322.7743 Td
(5081     *\(uint*\)\(mem+argp + 4*i\) = sp;  // argv[i]) 222.7942 Tj
0 -332.2676 Td
(5082   }) 34.9481 Tj
0 -341.761 Td
(5083 ) 21.8426 Tj
0 -351.2543 Td
(5084   // Stack frame for main\(argc, argv\), below arguments.) 262.1109 Tj
0 -360.7477 Td
(5085   sp = argp;) 74.2647 Tj
0 -370.2411 Td
(5086   sp -= 4;) 65.5277 Tj
0 -379.7344 Td
(5087   *\(uint*\)\(mem+sp\) = argp;) 135.4239 Tj
0 -389.2278 Td
(5088   sp -= 4;) 65.5277 Tj
0 -398.7211 Td
(5089   *\(uint*\)\(mem+sp\) = argc;) 135.4239 Tj
0 -408.2145 Td
(5090   sp -= 4;) 65.5277 Tj
0 -417.7079 Td
(5091   *\(uint*\)\(mem+sp\) = 0xffffffff;   // fake return pc) 249.0053 Tj
0 -427.2012 Td
(5092 ) 21.8426 Tj
0 -436.6946 Td
(5093   // Save program name for debugging.) 183.4776 Tj
0 -446.1879 Td
(5094   for\(last=s=path; *s; s++\)) 139.7925 Tj
0 -455.6813 Td
(5095     if\(*s == '/'\)) 96.1073 Tj
0 -465.1747 Td
(5096       last = s+1;) 96.1073 Tj
0 -474.668 Td
(5097   safestrcpy\(cp->name, last, sizeof\(cp->name\)\);) 227.1628 Tj
0 -484.1614 Td
(5098 ) 21.8426 Tj
0 -493.6547 Td
(5099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 50) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 58 58
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
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[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/exec.c  Page 3) 161.635 Tj
0 -28.4801 Td
(5100   // Commit to the new image.) 148.5295 Tj
0 -37.9735 Td
(5101   kfree\(cp->mem, cp->sz\);) 131.0554 Tj
0 -47.4668 Td
(5102   cp->mem = mem;) 91.7388 Tj
0 -56.9602 Td
(5103   cp->sz = sz;) 83.0018 Tj
0 -66.4535 Td
(5104   cp->tf->eip = elf.entry;  // main) 174.7406 Tj
0 -75.9469 Td
(5105   cp->tf->esp = sp;) 104.8443 Tj
0 -85.4403 Td
(5106   setupsegs\(cp\);) 91.7388 Tj
0 -94.9336 Td
(5107   return 0;) 69.8962 Tj
0 -104.427 Td
(5108 ) 21.8426 Tj
0 -113.9203 Td
(5109  bad:) 43.6851 Tj
0 -123.4137 Td
(5110   if\(mem\)) 61.1592 Tj
0 -132.9071 Td
(5111     kfree\(mem, sz\);) 104.8443 Tj
0 -142.4004 Td
(5112   iunlockput\(ip\);) 96.1073 Tj
0 -151.8938 Td
(5113   return -1;) 74.2647 Tj
0 -161.3871 Td
(5114 }) 26.2111 Tj
0 -170.8805 Td
(5115 ) 21.8426 Tj
0 -180.3739 Td
(5116 ) 21.8426 Tj
0 -189.8672 Td
(5117 ) 21.8426 Tj
0 -199.3606 Td
(5118 ) 21.8426 Tj
0 -208.8539 Td
(5119 ) 21.8426 Tj
0 -218.3473 Td
(5120 ) 21.8426 Tj
0 -227.8407 Td
(5121 ) 21.8426 Tj
0 -237.334 Td
(5122 ) 21.8426 Tj
0 -246.8274 Td
(5123 ) 21.8426 Tj
0 -256.3207 Td
(5124 ) 21.8426 Tj
0 -265.8141 Td
(5125 ) 21.8426 Tj
0 -275.3075 Td
(5126 ) 21.8426 Tj
0 -284.8008 Td
(5127 ) 21.8426 Tj
0 -294.2942 Td
(5128 ) 21.8426 Tj
0 -303.7875 Td
(5129 ) 21.8426 Tj
0 -313.2809 Td
(5130 ) 21.8426 Tj
0 -322.7743 Td
(5131 ) 21.8426 Tj
0 -332.2676 Td
(5132 ) 21.8426 Tj
0 -341.761 Td
(5133 ) 21.8426 Tj
0 -351.2543 Td
(5134 ) 21.8426 Tj
0 -360.7477 Td
(5135 ) 21.8426 Tj
0 -370.2411 Td
(5136 ) 21.8426 Tj
0 -379.7344 Td
(5137 ) 21.8426 Tj
0 -389.2278 Td
(5138 ) 21.8426 Tj
0 -398.7211 Td
(5139 ) 21.8426 Tj
0 -408.2145 Td
(5140 ) 21.8426 Tj
0 -417.7079 Td
(5141 ) 21.8426 Tj
0 -427.2012 Td
(5142 ) 21.8426 Tj
0 -436.6946 Td
(5143 ) 21.8426 Tj
0 -446.1879 Td
(5144 ) 21.8426 Tj
0 -455.6813 Td
(5145 ) 21.8426 Tj
0 -465.1747 Td
(5146 ) 21.8426 Tj
0 -474.668 Td
(5147 ) 21.8426 Tj
0 -484.1614 Td
(5148 ) 21.8426 Tj
0 -493.6547 Td
(5149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 51) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/pipe.c  Page 1) 161.635 Tj
0 -28.4801 Td
(5150 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(5151 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(5152 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(5153 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(5154 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(5155 #include "file.h") 96.1073 Tj
0 -85.4403 Td
(5156 #include "spinlock.h") 113.5814 Tj
0 -94.9336 Td
(5157 ) 21.8426 Tj
0 -104.427 Td
(5158 #define PIPESIZE 512) 109.2129 Tj
0 -113.9203 Td
(5159 ) 21.8426 Tj
0 -123.4137 Td
(5160 struct pipe {) 78.6333 Tj
0 -132.9071 Td
(5161   int readopen;   // read fd is still open) 205.3202 Tj
0 -142.4004 Td
(5162   int writeopen;  // write fd is still open) 209.6887 Tj
0 -151.8938 Td
(5163   uint writep;    // next index to write) 196.5831 Tj
0 -161.3871 Td
(5164   uint readp;     // next index to read) 192.2146 Tj
0 -170.8805 Td
(5165   struct spinlock lock;) 122.3184 Tj
0 -180.3739 Td
(5166   char data[PIPESIZE];) 117.9499 Tj
0 -189.8672 Td
(5167 };) 30.5796 Tj
0 -199.3606 Td
(5168 ) 21.8426 Tj
0 -208.8539 Td
(5169 int) 34.9481 Tj
0 -218.3473 Td
(5170 pipealloc\(struct file **f0, struct file **f1\)) 218.4257 Tj
0 -227.8407 Td
(5171 {) 26.2111 Tj
0 -237.334 Td
(5172   struct pipe *p;) 96.1073 Tj
0 -246.8274 Td
(5173 ) 21.8426 Tj
0 -256.3207 Td
(5174   p = 0;) 56.7907 Tj
0 -265.8141 Td
(5175   *f0 = *f1 = 0;) 91.7388 Tj
0 -275.3075 Td
(5176   if\(\(*f0 = filealloc\(\)\) == 0 || \(*f1 = filealloc\(\)\
\) == 0\)) 275.2164 Tj
0 -284.8008 Td
(5177     goto bad;) 78.6333 Tj
0 -294.2942 Td
(5178   if\(\(p = \(struct pipe*\)kalloc\(PAGE\)\) == 0\)) 209.6887 Tj
0 -303.7875 Td
(5179     goto bad;) 78.6333 Tj
0 -313.2809 Td
(5180   p->readopen = 1;) 100.4758 Tj
0 -322.7743 Td
(5181   p->writeopen = 1;) 104.8443 Tj
0 -332.2676 Td
(5182   p->writep = 0;) 91.7388 Tj
0 -341.761 Td
(5183   p->readp = 0;) 87.3703 Tj
0 -351.2543 Td
(5184   initlock\(&p->lock, "pipe"\);) 148.5295 Tj
0 -360.7477 Td
(5185   \(*f0\)->type = FD_PIPE;) 126.6869 Tj
0 -370.2411 Td
(5186   \(*f0\)->readable = 1;) 117.9499 Tj
0 -379.7344 Td
(5187   \(*f0\)->writable = 0;) 117.9499 Tj
0 -389.2278 Td
(5188   \(*f0\)->pipe = p;) 100.4758 Tj
0 -398.7211 Td
(5189   \(*f1\)->type = FD_PIPE;) 126.6869 Tj
0 -408.2145 Td
(5190   \(*f1\)->readable = 0;) 117.9499 Tj
0 -417.7079 Td
(5191   \(*f1\)->writable = 1;) 117.9499 Tj
0 -427.2012 Td
(5192   \(*f1\)->pipe = p;) 100.4758 Tj
0 -436.6946 Td
(5193   return 0;) 69.8962 Tj
0 -446.1879 Td
(5194 ) 21.8426 Tj
0 -455.6813 Td
(5195 ) 21.8426 Tj
0 -465.1747 Td
(5196 ) 21.8426 Tj
0 -474.668 Td
(5197 ) 21.8426 Tj
0 -484.1614 Td
(5198 ) 21.8426 Tj
0 -493.6547 Td
(5199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 51) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 59 59
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/pipe.c  Page 2) 161.635 Tj
0 -28.4801 Td
(5200  bad:) 43.6851 Tj
0 -37.9735 Td
(5201   if\(p\)) 52.4222 Tj
0 -47.4668 Td
(5202     kfree\(\(char*\)p, PAGE\);) 135.4239 Tj
0 -56.9602 Td
(5203   if\(*f0\){) 65.5277 Tj
0 -66.4535 Td
(5204     \(*f0\)->type = FD_NONE;) 135.4239 Tj
0 -75.9469 Td
(5205     fileclose\(*f0\);) 104.8443 Tj
0 -85.4403 Td
(5206   }) 34.9481 Tj
0 -94.9336 Td
(5207   if\(*f1\){) 65.5277 Tj
0 -104.427 Td
(5208     \(*f1\)->type = FD_NONE;) 135.4239 Tj
0 -113.9203 Td
(5209     fileclose\(*f1\);) 104.8443 Tj
0 -123.4137 Td
(5210   }) 34.9481 Tj
0 -132.9071 Td
(5211   return -1;) 74.2647 Tj
0 -142.4004 Td
(5212 }) 26.2111 Tj
0 -151.8938 Td
(5213 ) 21.8426 Tj
0 -161.3871 Td
(5214 void) 39.3166 Tj
0 -170.8805 Td
(5215 pipeclose\(struct pipe *p, int writable\)) 192.2146 Tj
0 -180.3739 Td
(5216 {) 26.2111 Tj
0 -189.8672 Td
(5217   acquire\(&p->lock\);) 109.2129 Tj
0 -199.3606 Td
(5218   if\(writable\){) 87.3703 Tj
0 -208.8539 Td
(5219     p->writeopen = 0;) 113.5814 Tj
0 -218.3473 Td
(5220     wakeup\(&p->readp\);) 117.9499 Tj
0 -227.8407 Td
(5221   } else {) 65.5277 Tj
0 -237.334 Td
(5222     p->readopen = 0;) 109.2129 Tj
0 -246.8274 Td
(5223     wakeup\(&p->writep\);) 122.3184 Tj
0 -256.3207 Td
(5224   }) 34.9481 Tj
0 -265.8141 Td
(5225   release\(&p->lock\);) 109.2129 Tj
0 -275.3075 Td
(5226 ) 21.8426 Tj
0 -284.8008 Td
(5227   if\(p->readopen == 0 && p->writeopen == 0\)) 209.6887 Tj
0 -294.2942 Td
(5228     kfree\(\(char*\)p, PAGE\);) 135.4239 Tj
0 -303.7875 Td
(5229 }) 26.2111 Tj
0 -313.2809 Td
(5230 ) 21.8426 Tj
0 -322.7743 Td
(5231 ) 21.8426 Tj
0 -332.2676 Td
(5232 ) 21.8426 Tj
0 -341.761 Td
(5233 ) 21.8426 Tj
0 -351.2543 Td
(5234 ) 21.8426 Tj
0 -360.7477 Td
(5235 ) 21.8426 Tj
0 -370.2411 Td
(5236 ) 21.8426 Tj
0 -379.7344 Td
(5237 ) 21.8426 Tj
0 -389.2278 Td
(5238 ) 21.8426 Tj
0 -398.7211 Td
(5239 ) 21.8426 Tj
0 -408.2145 Td
(5240 ) 21.8426 Tj
0 -417.7079 Td
(5241 ) 21.8426 Tj
0 -427.2012 Td
(5242 ) 21.8426 Tj
0 -436.6946 Td
(5243 ) 21.8426 Tj
0 -446.1879 Td
(5244 ) 21.8426 Tj
0 -455.6813 Td
(5245 ) 21.8426 Tj
0 -465.1747 Td
(5246 ) 21.8426 Tj
0 -474.668 Td
(5247 ) 21.8426 Tj
0 -484.1614 Td
(5248 ) 21.8426 Tj
0 -493.6547 Td
(5249 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 52) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/pipe.c  Page 3) 161.635 Tj
0 -28.4801 Td
(5250 int) 34.9481 Tj
0 -37.9735 Td
(5251 pipewrite\(struct pipe *p, char *addr, int n\)) 214.0572 Tj
0 -47.4668 Td
(5252 {) 26.2111 Tj
0 -56.9602 Td
(5253   int i;) 56.7907 Tj
0 -66.4535 Td
(5254 ) 21.8426 Tj
0 -75.9469 Td
(5255   acquire\(&p->lock\);) 109.2129 Tj
0 -85.4403 Td
(5256   for\(i = 0; i < n; i++\){) 131.0554 Tj
0 -94.9336 Td
(5257     while\(p->writep == p->readp + PIPESIZE\) {) 218.4257 Tj
0 -104.427 Td
(5258       if\(p->readopen == 0 || cp->killed\){) 200.9517 Tj
0 -113.9203 Td
(5259         release\(&p->lock\);) 135.4239 Tj
0 -123.4137 Td
(5260         return -1;) 100.4758 Tj
0 -132.9071 Td
(5261       }) 52.4222 Tj
0 -142.4004 Td
(5262       wakeup\(&p->readp\);) 126.6869 Tj
0 -151.8938 Td
(5263       sleep\(&p->writep, &p->lock\);) 170.3721 Tj
0 -161.3871 Td
(5264     }) 43.6851 Tj
0 -170.8805 Td
(5265     p->data[p->writep++ % PIPESIZE] = addr[i];) 222.7942 Tj
0 -180.3739 Td
(5266   }) 34.9481 Tj
0 -189.8672 Td
(5267   wakeup\(&p->readp\);) 109.2129 Tj
0 -199.3606 Td
(5268   release\(&p->lock\);) 109.2129 Tj
0 -208.8539 Td
(5269   return i;) 69.8962 Tj
0 -218.3473 Td
(5270 }) 26.2111 Tj
0 -227.8407 Td
(5271 ) 21.8426 Tj
0 -237.334 Td
(5272 int) 34.9481 Tj
0 -246.8274 Td
(5273 piperead\(struct pipe *p, char *addr, int n\)) 209.6887 Tj
0 -256.3207 Td
(5274 {) 26.2111 Tj
0 -265.8141 Td
(5275   int i;) 56.7907 Tj
0 -275.3075 Td
(5276 ) 21.8426 Tj
0 -284.8008 Td
(5277   acquire\(&p->lock\);) 109.2129 Tj
0 -294.2942 Td
(5278   while\(p->readp == p->writep && p->writeopen\){) 227.1628 Tj
0 -303.7875 Td
(5279     if\(cp->killed\){) 104.8443 Tj
0 -313.2809 Td
(5280       release\(&p->lock\);) 126.6869 Tj
0 -322.7743 Td
(5281       return -1;) 91.7388 Tj
0 -332.2676 Td
(5282     }) 43.6851 Tj
0 -341.761 Td
(5283     sleep\(&p->readp, &p->lock\);) 157.2665 Tj
0 -351.2543 Td
(5284   }) 34.9481 Tj
0 -360.7477 Td
(5285   for\(i = 0; i < n; i++\){) 131.0554 Tj
0 -370.2411 Td
(5286     if\(p->readp == p->writep\)) 148.5295 Tj
0 -379.7344 Td
(5287       break;) 74.2647 Tj
0 -389.2278 Td
(5288     addr[i] = p->data[p->readp++ % PIPESIZE];) 218.4257 Tj
0 -398.7211 Td
(5289   }) 34.9481 Tj
0 -408.2145 Td
(5290   wakeup\(&p->writep\);) 113.5814 Tj
0 -417.7079 Td
(5291   release\(&p->lock\);) 109.2129 Tj
0 -427.2012 Td
(5292   return i;) 69.8962 Tj
0 -436.6946 Td
(5293 }) 26.2111 Tj
0 -446.1879 Td
(5294 ) 21.8426 Tj
0 -455.6813 Td
(5295 ) 21.8426 Tj
0 -465.1747 Td
(5296 ) 21.8426 Tj
0 -474.668 Td
(5297 ) 21.8426 Tj
0 -484.1614 Td
(5298 ) 21.8426 Tj
0 -493.6547 Td
(5299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 52) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 60 60
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/string.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(5300 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(5301 ) 21.8426 Tj
0 -47.4668 Td
(5302 void*) 43.6851 Tj
0 -56.9602 Td
(5303 memset\(void *dst, int c, uint n\)) 161.635 Tj
0 -66.4535 Td
(5304 {) 26.2111 Tj
0 -75.9469 Td
(5305   char *d;) 65.5277 Tj
0 -85.4403 Td
(5306 ) 21.8426 Tj
0 -94.9336 Td
(5307   d = \(char*\)dst;) 96.1073 Tj
0 -104.427 Td
(5308   while\(n-- > 0\)) 91.7388 Tj
0 -113.9203 Td
(5309     *d++ = c;) 78.6333 Tj
0 -123.4137 Td
(5310 ) 21.8426 Tj
0 -132.9071 Td
(5311   return dst;) 78.6333 Tj
0 -142.4004 Td
(5312 }) 26.2111 Tj
0 -151.8938 Td
(5313 ) 21.8426 Tj
0 -161.3871 Td
(5314 int) 34.9481 Tj
0 -170.8805 Td
(5315 memcmp\(const void *v1, const void *v2, uint n\)) 222.7942 Tj
0 -180.3739 Td
(5316 {) 26.2111 Tj
0 -189.8672 Td
(5317   const uchar *s1, *s2;) 122.3184 Tj
0 -199.3606 Td
(5318 ) 21.8426 Tj
0 -208.8539 Td
(5319   s1 = v1;) 65.5277 Tj
0 -218.3473 Td
(5320   s2 = v2;) 65.5277 Tj
0 -227.8407 Td
(5321   while\(n-- > 0\){) 96.1073 Tj
0 -237.334 Td
(5322     if\(*s1 != *s2\)) 100.4758 Tj
0 -246.8274 Td
(5323       return *s1 - *s2;) 122.3184 Tj
0 -256.3207 Td
(5324     s1++, s2++;) 87.3703 Tj
0 -265.8141 Td
(5325   }) 34.9481 Tj
0 -275.3075 Td
(5326 ) 21.8426 Tj
0 -284.8008 Td
(5327   return 0;) 69.8962 Tj
0 -294.2942 Td
(5328 }) 26.2111 Tj
0 -303.7875 Td
(5329 ) 21.8426 Tj
0 -313.2809 Td
(5330 void*) 43.6851 Tj
0 -322.7743 Td
(5331 memmove\(void *dst, const void *src, uint n\)) 209.6887 Tj
0 -332.2676 Td
(5332 {) 26.2111 Tj
0 -341.761 Td
(5333   const char *s;) 91.7388 Tj
0 -351.2543 Td
(5334   char *d;) 65.5277 Tj
0 -360.7477 Td
(5335 ) 21.8426 Tj
0 -370.2411 Td
(5336   s = src;) 65.5277 Tj
0 -379.7344 Td
(5337   d = dst;) 65.5277 Tj
0 -389.2278 Td
(5338   if\(s < d && s + n > d\){) 131.0554 Tj
0 -398.7211 Td
(5339     s += n;) 69.8962 Tj
0 -408.2145 Td
(5340     d += n;) 69.8962 Tj
0 -417.7079 Td
(5341     while\(n-- > 0\)) 100.4758 Tj
0 -427.2012 Td
(5342       *--d = *--s;) 100.4758 Tj
0 -436.6946 Td
(5343   } else) 56.7907 Tj
0 -446.1879 Td
(5344     while\(n-- > 0\)) 100.4758 Tj
0 -455.6813 Td
(5345       *d++ = *s++;) 100.4758 Tj
0 -465.1747 Td
(5346 ) 21.8426 Tj
0 -474.668 Td
(5347   return dst;) 78.6333 Tj
0 -484.1614 Td
(5348 }) 26.2111 Tj
0 -493.6547 Td
(5349 ) 21.8426 Tj
0 -522.1348 Td
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(5380   if\(n <= 0\)) 74.2647 Tj
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(5381     return os;) 83.0018 Tj
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(5382   while\(--n > 0 && \(*s++ = *t++\) != 0\)) 187.8461 Tj
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(5383     ;) 43.6851 Tj
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(5384   *s = 0;) 61.1592 Tj
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(5385   return os;) 74.2647 Tj
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(5394     ;) 43.6851 Tj
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(5395   return n;) 69.8962 Tj
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(5400 // See MultiProcessor Specification Version 1.[14]) 240.2683 Tj
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(5401 ) 21.8426 Tj
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(5402 struct mp {             // floating pointer) 209.6887 Tj
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(5403   uchar signature[4];           // "_MP_") 200.9517 Tj
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(5404   void *physaddr;               // phys addr of MP config \
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(5405   uchar length;                 // 1) 179.1091 Tj
0 -85.4403 Td
(5406   uchar specrev;                // [14]) 192.2146 Tj
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(5407   uchar checksum;               // all bytes must add up t\
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(5408   uchar type;                   // MP system config type) 266.4794 Tj
0 -113.9203 Td
(5409   uchar imcrp;) 83.0018 Tj
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(5410   uchar reserved[3];) 109.2129 Tj
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(5411 };) 30.5796 Tj
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(5412 ) 21.8426 Tj
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(5413 struct mpconf {         // configuration table header) 253.3738 Tj
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(5414   uchar signature[4];           // "PCMP") 200.9517 Tj
0 -170.8805 Td
(5415   ushort length;                // total table length) 253.3738 Tj
0 -180.3739 Td
(5416   uchar version;                // [14]) 192.2146 Tj
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(5417   uchar checksum;               // all bytes must add up t\
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(5418   uchar product[20];            // product id) 218.4257 Tj
0 -208.8539 Td
(5419   uint *oemtable;               // OEM table pointer) 249.0053 Tj
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(5420   ushort oemlength;             // OEM table length) 244.6368 Tj
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(5421   ushort entry;                 // entry count) 222.7942 Tj
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(5422   uint *lapicaddr;              // address of local APIC) 266.4794 Tj
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(5423   ushort xlength;               // extended table length) 266.4794 Tj
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(5424   uchar xchecksum;              // extended table checksum) 275.2164 Tj
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(5425   uchar reserved;) 96.1073 Tj
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(5426 };) 30.5796 Tj
0 -284.8008 Td
(5427 ) 21.8426 Tj
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(5428 struct mpproc {         // processor table entry) 231.5313 Tj
0 -303.7875 Td
(5429   uchar type;                   // entry type \(0\)) 235.8998 Tj
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(5430   uchar apicid;                 // local APIC id) 231.5313 Tj
0 -322.7743 Td
(5431   uchar version;                // local APIC verison) 253.3738 Tj
0 -332.2676 Td
(5432   uchar flags;                  // CPU flags) 214.0572 Tj
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(5433     #define MPBOOT 0x02           // This proc is the boot\
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(5434   uchar signature[4];           // CPU signature) 231.5313 Tj
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(5435   uint feature;                 // feature flags from CPUI\
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(5436   uchar reserved[8];) 109.2129 Tj
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(5437 };) 30.5796 Tj
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(5439 struct mpioapic {       // I/O APIC table entry) 227.1628 Tj
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(5440   uchar type;                   // entry type \(2\)) 235.8998 Tj
0 -417.7079 Td
(5441   uchar apicno;                 // I/O APIC id) 222.7942 Tj
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(5442   uchar version;                // I/O APIC version) 244.6368 Tj
0 -436.6946 Td
(5443   uchar flags;                  // I/O APIC flags) 235.8998 Tj
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(5444   uint *addr;                  // I/O APIC address) 240.2683 Tj
0 -455.6813 Td
(5445 };) 30.5796 Tj
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(5446 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/mp.h  Page 2) 152.898 Tj
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(5450 // Table entry types) 109.2129 Tj
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(5451 #define MPPROC    0x00  // One per processor) 214.0572 Tj
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(5452 #define MPBUS     0x01  // One per bus) 187.8461 Tj
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(5453 #define MPIOAPIC  0x02  // One per I/O APIC) 209.6887 Tj
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(5454 #define MPIOINTR  0x03  // One per bus interrupt source) 262.1109 Tj
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(5460 ) 21.8426 Tj
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(5461 ) 21.8426 Tj
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(5462 ) 21.8426 Tj
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(5463 ) 21.8426 Tj
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(5464 ) 21.8426 Tj
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(5465 ) 21.8426 Tj
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(5496 ) 21.8426 Tj
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(Sep  3 10:05 2008  xv6/mp.c  Page 1) 152.898 Tj
0 -28.4801 Td
(5500 // Multiprocessor bootstrap.) 144.161 Tj
0 -37.9735 Td
(5501 // Search memory for MP description structures.) 227.1628 Tj
0 -47.4668 Td
(5502 // http://developer.intel.com/design/pentium/datashts/2420\
1606.pdf) 310.1645 Tj
0 -56.9602 Td
(5503 ) 21.8426 Tj
0 -66.4535 Td
(5504 #include "types.h") 100.4758 Tj
0 -75.9469 Td
(5505 #include "defs.h") 96.1073 Tj
0 -85.4403 Td
(5506 #include "param.h") 100.4758 Tj
0 -94.9336 Td
(5507 #include "mp.h") 87.3703 Tj
0 -104.427 Td
(5508 #include "x86.h") 91.7388 Tj
0 -113.9203 Td
(5509 #include "mmu.h") 91.7388 Tj
0 -123.4137 Td
(5510 #include "proc.h") 96.1073 Tj
0 -132.9071 Td
(5511 ) 21.8426 Tj
0 -142.4004 Td
(5512 struct cpu cpus[NCPU];) 117.9499 Tj
0 -151.8938 Td
(5513 static struct cpu *bcpu;) 126.6869 Tj
0 -161.3871 Td
(5514 int ismp;) 61.1592 Tj
0 -170.8805 Td
(5515 int ncpu;) 61.1592 Tj
0 -180.3739 Td
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0 -189.8672 Td
(5517 ) 21.8426 Tj
0 -199.3606 Td
(5518 int) 34.9481 Tj
0 -208.8539 Td
(5519 mp_bcpu\(void\)) 78.6333 Tj
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0 -227.8407 Td
(5521   return bcpu-cpus;) 104.8443 Tj
0 -237.334 Td
(5522 }) 26.2111 Tj
0 -246.8274 Td
(5523 ) 21.8426 Tj
0 -256.3207 Td
(5524 static uchar) 74.2647 Tj
0 -265.8141 Td
(5525 sum\(uchar *addr, int len\)) 131.0554 Tj
0 -275.3075 Td
(5526 {) 26.2111 Tj
0 -284.8008 Td
(5527   int i, sum;) 78.6333 Tj
0 -294.2942 Td
(5528 ) 21.8426 Tj
0 -303.7875 Td
(5529   sum = 0;) 65.5277 Tj
0 -313.2809 Td
(5530   for\(i=0; i<len; i++\)) 117.9499 Tj
0 -322.7743 Td
(5531     sum += addr[i];) 104.8443 Tj
0 -332.2676 Td
(5532   return sum;) 78.6333 Tj
0 -341.761 Td
(5533 }) 26.2111 Tj
0 -351.2543 Td
(5534 ) 21.8426 Tj
0 -360.7477 Td
(5535 // Look for an MP structure in the len bytes at addr.) 253.3738 Tj
0 -370.2411 Td
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0 -379.7344 Td
(5537 mp_search1\(uchar *addr, int len\)) 161.635 Tj
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(5539   uchar *e, *p;) 87.3703 Tj
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(5541   e = addr+len;) 87.3703 Tj
0 -427.2012 Td
(5542   for\(p = addr; p < e; p += sizeof\(struct mp\)\)) 222.7942 Tj
0 -436.6946 Td
(5543     if\(memcmp\(p, "_MP_", 4\) == 0 && sum\(p, sizeof\(str\
uct mp\)\) == 0\)) 314.533 Tj
0 -446.1879 Td
(5544       return \(struct mp*\)p;) 139.7925 Tj
0 -455.6813 Td
(5545   return 0;) 69.8962 Tj
0 -465.1747 Td
(5546 }) 26.2111 Tj
0 -474.668 Td
(5547 ) 21.8426 Tj
0 -484.1614 Td
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(Sep  3 10:05 2008  xv6/mp.c  Page 2) 152.898 Tj
0 -28.4801 Td
(5550 // Search for the MP Floating Pointer Structure, which acc\
ording to the) 332.0071 Tj
0 -37.9735 Td
(5551 // spec is in one of the following three locations:) 244.6368 Tj
0 -47.4668 Td
(5552 // 1\) in the first KB of the EBDA;) 170.3721 Tj
0 -56.9602 Td
(5553 // 2\) in the last KB of system base memory;) 209.6887 Tj
0 -66.4535 Td
(5554 // 3\) in the BIOS ROM between 0xE0000 and 0xFFFFF.) 240.2683 Tj
0 -75.9469 Td
(5555 static struct mp*) 96.1073 Tj
0 -85.4403 Td
(5556 mp_search\(void\)) 87.3703 Tj
0 -94.9336 Td
(5557 {) 26.2111 Tj
0 -104.427 Td
(5558   uchar *bda;) 78.6333 Tj
0 -113.9203 Td
(5559   uint p;) 61.1592 Tj
0 -123.4137 Td
(5560   struct mp *mp;) 91.7388 Tj
0 -132.9071 Td
(5561 ) 21.8426 Tj
0 -142.4004 Td
(5562   bda = \(uchar*\)0x400;) 117.9499 Tj
0 -151.8938 Td
(5563   if\(\(p = \(\(bda[0x0F]<<8\)|bda[0x0E]\) << 4\)\){) 214.0572 Tj
0 -161.3871 Td
(5564     if\(\(mp = mp_search1\(\(uchar*\)p, 1024\)\)\)) 205.3202 Tj
0 -170.8805 Td
(5565       return mp;) 91.7388 Tj
0 -180.3739 Td
(5566   } else {) 65.5277 Tj
0 -189.8672 Td
(5567     p = \(\(bda[0x14]<<8\)|bda[0x13]\)*1024;) 196.5831 Tj
0 -199.3606 Td
(5568     if\(\(mp = mp_search1\(\(uchar*\)p-1024, 1024\)\)\)) 227.1628 Tj
0 -208.8539 Td
(5569       return mp;) 91.7388 Tj
0 -218.3473 Td
(5570   }) 34.9481 Tj
0 -227.8407 Td
(5571   return mp_search1\(\(uchar*\)0xF0000, 0x10000\);) 222.7942 Tj
0 -237.334 Td
(5572 }) 26.2111 Tj
0 -246.8274 Td
(5573 ) 21.8426 Tj
0 -256.3207 Td
(5574 // Search for an MP configuration table.  For now,) 240.2683 Tj
0 -265.8141 Td
(5575 // don't accept the default configurations \(physaddr == 0\
\).) 279.5849 Tj
0 -275.3075 Td
(5576 // Check for correct signature, calculate the checksum and\
,) 279.5849 Tj
0 -284.8008 Td
(5577 // if correct, check the version.) 166.0035 Tj
0 -294.2942 Td
(5578 // To do: check extended table checksum.) 196.5831 Tj
0 -303.7875 Td
(5579 static struct mpconf*) 113.5814 Tj
0 -313.2809 Td
(5580 mp_config\(struct mp **pmp\)) 135.4239 Tj
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(5581 {) 26.2111 Tj
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(5582   struct mpconf *conf;) 117.9499 Tj
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(5583   struct mp *mp;) 91.7388 Tj
0 -351.2543 Td
(5584 ) 21.8426 Tj
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(5585   if\(\(mp = mp_search\(\)\) == 0 || mp->physaddr == 0\)) 240.2683 Tj
0 -370.2411 Td
(5586     return 0;) 78.6333 Tj
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(5587   conf = \(struct mpconf*\)mp->physaddr;) 187.8461 Tj
0 -389.2278 Td
(5588   if\(memcmp\(conf, "PCMP", 4\) != 0\)) 170.3721 Tj
0 -398.7211 Td
(5589     return 0;) 78.6333 Tj
0 -408.2145 Td
(5590   if\(conf->version != 1 && conf->version != 4\)) 222.7942 Tj
0 -417.7079 Td
(5591     return 0;) 78.6333 Tj
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(5592   if\(sum\(\(uchar*\)conf, conf->length\) != 0\)) 205.3202 Tj
0 -436.6946 Td
(5593     return 0;) 78.6333 Tj
0 -446.1879 Td
(5594   *pmp = mp;) 74.2647 Tj
0 -455.6813 Td
(5595   return conf;) 83.0018 Tj
0 -465.1747 Td
(5596 }) 26.2111 Tj
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(5597 ) 21.8426 Tj
0 -484.1614 Td
(5598 ) 21.8426 Tj
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(Sheet 55) 34.9481 Tj
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[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/mp.c  Page 3) 152.898 Tj
0 -28.4801 Td
(5600 void) 39.3166 Tj
0 -37.9735 Td
(5601 mp_init\(void\)) 78.6333 Tj
0 -47.4668 Td
(5602 {) 26.2111 Tj
0 -56.9602 Td
(5603   uchar *p, *e;) 87.3703 Tj
0 -66.4535 Td
(5604   struct mp *mp;) 91.7388 Tj
0 -75.9469 Td
(5605   struct mpconf *conf;) 117.9499 Tj
0 -85.4403 Td
(5606   struct mpproc *proc;) 117.9499 Tj
0 -94.9336 Td
(5607   struct mpioapic *ioapic;) 135.4239 Tj
0 -104.427 Td
(5608 ) 21.8426 Tj
0 -113.9203 Td
(5609   bcpu = &cpus[ncpu];) 113.5814 Tj
0 -123.4137 Td
(5610   if\(\(conf = mp_config\(&mp\)\) == 0\)) 170.3721 Tj
0 -132.9071 Td
(5611     return;) 69.8962 Tj
0 -142.4004 Td
(5612 ) 21.8426 Tj
0 -151.8938 Td
(5613   ismp = 1;) 69.8962 Tj
0 -161.3871 Td
(5614   lapic = \(uint*\)conf->lapicaddr;) 166.0035 Tj
0 -170.8805 Td
(5615 ) 21.8426 Tj
0 -180.3739 Td
(5616   for\(p=\(uchar*\)\(conf+1\), e=\(uchar*\)conf+conf->leng\
th; p<e; \){) 292.6905 Tj
0 -189.8672 Td
(5617     switch\(*p\){) 87.3703 Tj
0 -199.3606 Td
(5618     case MPPROC:) 91.7388 Tj
0 -208.8539 Td
(5619       proc = \(struct mpproc*\)p;) 157.2665 Tj
0 -218.3473 Td
(5620       cpus[ncpu].apicid = proc->apicid;) 192.2146 Tj
0 -227.8407 Td
(5621       if\(proc->flags & MPBOOT\)) 152.898 Tj
0 -237.334 Td
(5622         bcpu = &cpus[ncpu];) 139.7925 Tj
0 -246.8274 Td
(5623       ncpu++;) 78.6333 Tj
0 -256.3207 Td
(5624       p += sizeof\(struct mpproc\);) 166.0035 Tj
0 -265.8141 Td
(5625       continue;) 87.3703 Tj
0 -275.3075 Td
(5626     case MPIOAPIC:) 100.4758 Tj
0 -284.8008 Td
(5627       ioapic = \(struct mpioapic*\)p;) 174.7406 Tj
0 -294.2942 Td
(5628       ioapic_id = ioapic->apicno;) 166.0035 Tj
0 -303.7875 Td
(5629       p += sizeof\(struct mpioapic\);) 174.7406 Tj
0 -313.2809 Td
(5630       continue;) 87.3703 Tj
0 -322.7743 Td
(5631     case MPBUS:) 87.3703 Tj
0 -332.2676 Td
(5632     case MPIOINTR:) 100.4758 Tj
0 -341.761 Td
(5633     case MPLINTR:) 96.1073 Tj
0 -351.2543 Td
(5634       p += 8;) 78.6333 Tj
0 -360.7477 Td
(5635       continue;) 87.3703 Tj
0 -370.2411 Td
(5636     default:) 74.2647 Tj
0 -379.7344 Td
(5637       cprintf\("mp_init: unknown config type %x\\n", *p\);) 262.1109 Tj
0 -389.2278 Td
(5638       panic\("mp_init"\);) 122.3184 Tj
0 -398.7211 Td
(5639     }) 43.6851 Tj
0 -408.2145 Td
(5640   }) 34.9481 Tj
0 -417.7079 Td
(5641 ) 21.8426 Tj
0 -427.2012 Td
(5642   if\(mp->imcrp\){) 91.7388 Tj
0 -436.6946 Td
(5643     // Bochs doesn't support IMCR, so this doesn't run on \
Bochs.) 301.4275 Tj
0 -446.1879 Td
(5644     // But it would on real hardware.) 183.4776 Tj
0 -455.6813 Td
(5645     outb\(0x22, 0x70\);   // Select IMCR) 187.8461 Tj
0 -465.1747 Td
(5646     outb\(0x23, inb\(0x23\) | 1\);  // Mask external inter\
rupts.) 283.9534 Tj
0 -474.668 Td
(5647   }) 34.9481 Tj
0 -484.1614 Td
(5648 }) 26.2111 Tj
0 -493.6547 Td
(5649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 56) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/lapic.c  Page 1) 166.0035 Tj
0 -28.4801 Td
(5650 // The local APIC manages internal \(non-I/O\) interrupts.) 266.4794 Tj
0 -37.9735 Td
(5651 // See Chapter 8 & Appendix C of Intel processor manual vo\
lume 3.) 305.796 Tj
0 -47.4668 Td
(5652 ) 21.8426 Tj
0 -56.9602 Td
(5653 #include "types.h") 100.4758 Tj
0 -66.4535 Td
(5654 #include "defs.h") 96.1073 Tj
0 -75.9469 Td
(5655 #include "traps.h") 100.4758 Tj
0 -85.4403 Td
(5656 #include "mmu.h") 91.7388 Tj
0 -94.9336 Td
(5657 #include "x86.h") 91.7388 Tj
0 -104.427 Td
(5658 ) 21.8426 Tj
0 -113.9203 Td
(5659 // Local APIC registers, divided by 4 for use as uint[] in\
dices.) 301.4275 Tj
0 -123.4137 Td
(5660 #define ID      \(0x0020/4\)   // ID) 170.3721 Tj
0 -132.9071 Td
(5661 #define VER     \(0x0030/4\)   // Version) 192.2146 Tj
0 -142.4004 Td
(5662 #define TPR     \(0x0080/4\)   // Task Priority) 218.4257 Tj
0 -151.8938 Td
(5663 #define EOI     \(0x00B0/4\)   // EOI) 174.7406 Tj
0 -161.3871 Td
(5664 #define SVR     \(0x00F0/4\)   // Spurious Interrupt Vecto\
r) 270.8479 Tj
0 -170.8805 Td
(5665   #define ENABLE     0x00000100   // Unit Enable) 231.5313 Tj
0 -180.3739 Td
(5666 #define ESR     \(0x0280/4\)   // Error Status) 214.0572 Tj
0 -189.8672 Td
(5667 #define ICRLO   \(0x0300/4\)   // Interrupt Command) 235.8998 Tj
0 -199.3606 Td
(5668   #define INIT       0x00000500   // INIT/RESET) 227.1628 Tj
0 -208.8539 Td
(5669   #define STARTUP    0x00000600   // Startup IPI) 231.5313 Tj
0 -218.3473 Td
(5670   #define DELIVS     0x00001000   // Delivery status) 249.0053 Tj
0 -227.8407 Td
(5671   #define ASSERT     0x00004000   // Assert interrupt \(vs\
 deassert\)) 314.533 Tj
0 -237.334 Td
(5672   #define LEVEL      0x00008000   // Level triggered) 249.0053 Tj
0 -246.8274 Td
(5673   #define BCAST      0x00080000   // Send to all APICs, in\
cluding self.) 332.0071 Tj
0 -256.3207 Td
(5674 #define ICRHI   \(0x0310/4\)   // Interrupt Command [63:32\
]) 270.8479 Tj
0 -265.8141 Td
(5675 #define TIMER   \(0x0320/4\)   // Local Vector Table 0 \(T\
IMER\)) 283.9534 Tj
0 -275.3075 Td
(5676   #define X1         0x0000000B   // divide counts by 1) 262.1109 Tj
0 -284.8008 Td
(5677   #define PERIODIC   0x00020000   // Periodic) 218.4257 Tj
0 -294.2942 Td
(5678 #define PCINT   \(0x0340/4\)   // Performance Counter LVT) 262.1109 Tj
0 -303.7875 Td
(5679 #define LINT0   \(0x0350/4\)   // Local Vector Table 1 \(L\
INT0\)) 283.9534 Tj
0 -313.2809 Td
(5680 #define LINT1   \(0x0360/4\)   // Local Vector Table 2 \(L\
INT1\)) 283.9534 Tj
0 -322.7743 Td
(5681 #define ERROR   \(0x0370/4\)   // Local Vector Table 3 \(E\
RROR\)) 283.9534 Tj
0 -332.2676 Td
(5682   #define MASKED     0x00010000   // Interrupt masked) 253.3738 Tj
0 -341.761 Td
(5683 #define TICR    \(0x0380/4\)   // Timer Initial Count) 244.6368 Tj
0 -351.2543 Td
(5684 #define TCCR    \(0x0390/4\)   // Timer Current Count) 244.6368 Tj
0 -360.7477 Td
(5685 #define TDCR    \(0x03E0/4\)   // Timer Divide Configurati\
on) 275.2164 Tj
0 -370.2411 Td
(5686 ) 21.8426 Tj
0 -379.7344 Td
(5687 volatile uint *lapic;  // Initialized in mp.c) 218.4257 Tj
0 -389.2278 Td
(5688 ) 21.8426 Tj
0 -398.7211 Td
(5689 static void) 69.8962 Tj
0 -408.2145 Td
(5690 lapicw\(int index, int value\)) 144.161 Tj
0 -417.7079 Td
(5691 {) 26.2111 Tj
0 -427.2012 Td
(5692   lapic[index] = value;) 122.3184 Tj
0 -436.6946 Td
(5693   lapic[ID];  // wait for write to finish, by reading) 253.3738 Tj
0 -446.1879 Td
(5694 }) 26.2111 Tj
0 -455.6813 Td
(5695 ) 21.8426 Tj
0 -465.1747 Td
(5696 ) 21.8426 Tj
0 -474.668 Td
(5697 ) 21.8426 Tj
0 -484.1614 Td
(5698 ) 21.8426 Tj
0 -493.6547 Td
(5699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 56) 34.9481 Tj
Q
Q
Q
Q
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0 0 612 792 re W
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[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/lapic.c  Page 2) 166.0035 Tj
0 -28.4801 Td
(5700 void) 39.3166 Tj
0 -37.9735 Td
(5701 lapic_init\(int c\)) 96.1073 Tj
0 -47.4668 Td
(5702 {) 26.2111 Tj
0 -56.9602 Td
(5703   if\(!lapic\)) 74.2647 Tj
0 -66.4535 Td
(5704     return;) 69.8962 Tj
0 -75.9469 Td
(5705 ) 21.8426 Tj
0 -85.4403 Td
(5706   // Enable local APIC; set spurious interrupt vector.) 257.7424 Tj
0 -94.9336 Td
(5707   lapicw\(SVR, ENABLE | \(IRQ_OFFSET+IRQ_SPURIOUS\)\);) 240.2683 Tj
0 -104.427 Td
(5708 ) 21.8426 Tj
0 -113.9203 Td
(5709   // The timer repeatedly counts down at bus frequency) 257.7424 Tj
0 -123.4137 Td
(5710   // from lapic[TICR] and then issues an interrupt.) 244.6368 Tj
0 -132.9071 Td
(5711   // If xv6 cared more about precise timekeeping,) 235.8998 Tj
0 -142.4004 Td
(5712   // TICR would be calibrated using an external time sourc\
e.) 283.9534 Tj
0 -151.8938 Td
(5713   lapicw\(TDCR, X1\);) 104.8443 Tj
0 -161.3871 Td
(5714   lapicw\(TIMER, PERIODIC | \(IRQ_OFFSET + IRQ_TIMER\)\);) 253.3738 Tj
0 -170.8805 Td
(5715   lapicw\(TICR, 10000000\);) 131.0554 Tj
0 -180.3739 Td
(5716 ) 21.8426 Tj
0 -189.8672 Td
(5717   // Disable logical interrupt lines.) 183.4776 Tj
0 -199.3606 Td
(5718   lapicw\(LINT0, MASKED\);) 126.6869 Tj
0 -208.8539 Td
(5719   lapicw\(LINT1, MASKED\);) 126.6869 Tj
0 -218.3473 Td
(5720 ) 21.8426 Tj
0 -227.8407 Td
(5721   // Disable performance counter overflow interrupts) 249.0053 Tj
0 -237.334 Td
(5722   // on machines that provide that interrupt entry.) 244.6368 Tj
0 -246.8274 Td
(5723   if\(\(\(lapic[VER]>>16\) & 0xFF\) >= 4\)) 179.1091 Tj
0 -256.3207 Td
(5724     lapicw\(PCINT, MASKED\);) 135.4239 Tj
0 -265.8141 Td
(5725 ) 21.8426 Tj
0 -275.3075 Td
(5726   // Map error interrupt to IRQ_ERROR.) 187.8461 Tj
0 -284.8008 Td
(5727   lapicw\(ERROR, IRQ_OFFSET+IRQ_ERROR\);) 187.8461 Tj
0 -294.2942 Td
(5728 ) 21.8426 Tj
0 -303.7875 Td
(5729   // Clear error status register \(requires back-to-back w\
rites\).) 301.4275 Tj
0 -313.2809 Td
(5730   lapicw\(ESR, 0\);) 96.1073 Tj
0 -322.7743 Td
(5731   lapicw\(ESR, 0\);) 96.1073 Tj
0 -332.2676 Td
(5732 ) 21.8426 Tj
0 -341.761 Td
(5733   // Ack any outstanding interrupts.) 179.1091 Tj
0 -351.2543 Td
(5734   lapicw\(EOI, 0\);) 96.1073 Tj
0 -360.7477 Td
(5735 ) 21.8426 Tj
0 -370.2411 Td
(5736   // Send an Init Level De-Assert to synchronise arbitrati\
on ID's.) 310.1645 Tj
0 -379.7344 Td
(5737   lapicw\(ICRHI, 0\);) 104.8443 Tj
0 -389.2278 Td
(5738   lapicw\(ICRLO, BCAST | INIT | LEVEL\);) 187.8461 Tj
0 -398.7211 Td
(5739   while\(lapic[ICRLO] & DELIVS\)) 152.898 Tj
0 -408.2145 Td
(5740     ;) 43.6851 Tj
0 -417.7079 Td
(5741 ) 21.8426 Tj
0 -427.2012 Td
(5742   // Enable interrupts on the APIC \(but not on the proces\
sor\).) 292.6905 Tj
0 -436.6946 Td
(5743   lapicw\(TPR, 0\);) 96.1073 Tj
0 -446.1879 Td
(5744 }) 26.2111 Tj
0 -455.6813 Td
(5745 ) 21.8426 Tj
0 -465.1747 Td
(5746 ) 21.8426 Tj
0 -474.668 Td
(5747 ) 21.8426 Tj
0 -484.1614 Td
(5748 ) 21.8426 Tj
0 -493.6547 Td
(5749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 57) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/lapic.c  Page 3) 166.0035 Tj
0 -28.4801 Td
(5750 int) 34.9481 Tj
0 -37.9735 Td
(5751 cpu\(void\)) 61.1592 Tj
0 -47.4668 Td
(5752 {) 26.2111 Tj
0 -56.9602 Td
(5753   // Cannot call cpu when interrupts are enabled:) 235.8998 Tj
0 -66.4535 Td
(5754   // result not guaranteed to last long enough to be used!) 275.2164 Tj
0 -75.9469 Td
(5755   // Would prefer to panic but even printing is chancy her\
e:) 283.9534 Tj
0 -85.4403 Td
(5756   // everything, including cprintf, calls cpu, at least in\
directly) 310.1645 Tj
0 -94.9336 Td
(5757   // through acquire and release.) 166.0035 Tj
0 -104.427 Td
(5758   if\(read_eflags\(\)&FL_IF\){) 135.4239 Tj
0 -113.9203 Td
(5759     static int n;) 96.1073 Tj
0 -123.4137 Td
(5760     if\(n++ == 0\)) 91.7388 Tj
0 -132.9071 Td
(5761       cprintf\("cpu called from %x with interrupts enabled\
\\n",) 288.322 Tj
0 -142.4004 Td
(5762         \(\(uint*\)read_ebp\(\)\)[1]\);) 161.635 Tj
0 -151.8938 Td
(5763   }) 34.9481 Tj
0 -161.3871 Td
(5764 ) 21.8426 Tj
0 -170.8805 Td
(5765   if\(lapic\)) 69.8962 Tj
0 -180.3739 Td
(5766     return lapic[ID]>>24;) 131.0554 Tj
0 -189.8672 Td
(5767   return 0;) 69.8962 Tj
0 -199.3606 Td
(5768 }) 26.2111 Tj
0 -208.8539 Td
(5769 ) 21.8426 Tj
0 -218.3473 Td
(5770 // Acknowledge interrupt.) 131.0554 Tj
0 -227.8407 Td
(5771 void) 39.3166 Tj
0 -237.334 Td
(5772 lapic_eoi\(void\)) 87.3703 Tj
0 -246.8274 Td
(5773 {) 26.2111 Tj
0 -256.3207 Td
(5774   if\(lapic\)) 69.8962 Tj
0 -265.8141 Td
(5775     lapicw\(EOI, 0\);) 104.8443 Tj
0 -275.3075 Td
(5776 }) 26.2111 Tj
0 -284.8008 Td
(5777 ) 21.8426 Tj
0 -294.2942 Td
(5778 // Spin for a given number of microseconds.) 209.6887 Tj
0 -303.7875 Td
(5779 // On real hardware would want to tune this dynamically.) 266.4794 Tj
0 -313.2809 Td
(5780 static void) 69.8962 Tj
0 -322.7743 Td
(5781 microdelay\(int us\)) 100.4758 Tj
0 -332.2676 Td
(5782 {) 26.2111 Tj
0 -341.761 Td
(5783   volatile int j = 0;) 113.5814 Tj
0 -351.2543 Td
(5784 ) 21.8426 Tj
0 -360.7477 Td
(5785   while\(us-- > 0\)) 96.1073 Tj
0 -370.2411 Td
(5786     for\(j=0; j<10000; j++\);) 139.7925 Tj
0 -379.7344 Td
(5787 }) 26.2111 Tj
0 -389.2278 Td
(5788 ) 21.8426 Tj
0 -398.7211 Td
(5789 ) 21.8426 Tj
0 -408.2145 Td
(5790 ) 21.8426 Tj
0 -417.7079 Td
(5791 ) 21.8426 Tj
0 -427.2012 Td
(5792 ) 21.8426 Tj
0 -436.6946 Td
(5793 ) 21.8426 Tj
0 -446.1879 Td
(5794 ) 21.8426 Tj
0 -455.6813 Td
(5795 ) 21.8426 Tj
0 -465.1747 Td
(5796 ) 21.8426 Tj
0 -474.668 Td
(5797 ) 21.8426 Tj
0 -484.1614 Td
(5798 ) 21.8426 Tj
0 -493.6547 Td
(5799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 57) 34.9481 Tj
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0 0 612 792 re W
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[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/lapic.c  Page 4) 166.0035 Tj
0 -28.4801 Td
(5800 #define IO_RTC  0x70) 109.2129 Tj
0 -37.9735 Td
(5801 ) 21.8426 Tj
0 -47.4668 Td
(5802 // Start additional processor running bootstrap code at ad\
dr.) 288.322 Tj
0 -56.9602 Td
(5803 // See Appendix B of MultiProcessor Specification.) 240.2683 Tj
0 -66.4535 Td
(5804 void) 39.3166 Tj
0 -75.9469 Td
(5805 lapic_startap\(uchar apicid, uint addr\)) 187.8461 Tj
0 -85.4403 Td
(5806 {) 26.2111 Tj
0 -94.9336 Td
(5807   int i;) 56.7907 Tj
0 -104.427 Td
(5808   ushort *wrv;) 83.0018 Tj
0 -113.9203 Td
(5809 ) 21.8426 Tj
0 -123.4137 Td
(5810   // "The BSP must initialize CMOS shutdown code to 0AH) 262.1109 Tj
0 -132.9071 Td
(5811   // and the warm reset vector \(DWORD based at 40:67\) to\
 point at) 305.796 Tj
0 -142.4004 Td
(5812   // the AP startup code prior to the [universal startup a\
lgorithm].") 323.2701 Tj
0 -151.8938 Td
(5813   outb\(IO_RTC, 0xF\);  // offset 0xF is shutdown code) 249.0053 Tj
0 -161.3871 Td
(5814   outb\(IO_RTC+1, 0x0A\);) 122.3184 Tj
0 -170.8805 Td
(5815   wrv = \(ushort*\)\(0x40<<4 | 0x67\);  // Warm reset vect\
or) 266.4794 Tj
0 -180.3739 Td
(5816   wrv[0] = 0;) 78.6333 Tj
0 -189.8672 Td
(5817   wrv[1] = addr >> 4;) 113.5814 Tj
0 -199.3606 Td
(5818 ) 21.8426 Tj
0 -208.8539 Td
(5819   // "Universal startup algorithm.") 174.7406 Tj
0 -218.3473 Td
(5820   // Send INIT \(level-triggered\) interrupt to reset othe\
r CPU.) 292.6905 Tj
0 -227.8407 Td
(5821   lapicw\(ICRHI, apicid<<24\);) 144.161 Tj
0 -237.334 Td
(5822   lapicw\(ICRLO, INIT | LEVEL | ASSERT\);) 192.2146 Tj
0 -246.8274 Td
(5823   microdelay\(200\);) 100.4758 Tj
0 -256.3207 Td
(5824   lapicw\(ICRLO, INIT | LEVEL\);) 152.898 Tj
0 -265.8141 Td
(5825   microdelay\(100\);) 100.4758 Tj
-500.868 TJm
(// should be 10ms, but too slow in Bochs!) 179.1091 Tj
0 -275.3075 Td
(5826 ) 21.8426 Tj
0 -284.8008 Td
(5827   // Send startup IPI \(twice!\) to enter bootstrap code.) 262.1109 Tj
0 -294.2942 Td
(5828   // Regular hardware is supposed to only accept a STARTUP) 275.2164 Tj
0 -303.7875 Td
(5829   // when it is in the halted state due to an INIT.  So th\
e second) 310.1645 Tj
0 -313.2809 Td
(5830   // should be ignored, but it is part of the official Int\
el algorithm.) 332.0071 Tj
0 -322.7743 Td
(5831   // Bochs complains about the second one.  Too bad for Bo\
chs.) 292.6905 Tj
0 -332.2676 Td
(5832   for\(i = 0; i < 2; i++\){) 131.0554 Tj
0 -341.761 Td
(5833     lapicw\(ICRHI, apicid<<24\);) 152.898 Tj
0 -351.2543 Td
(5834     lapicw\(ICRLO, STARTUP | \(addr>>12\)\);) 196.5831 Tj
0 -360.7477 Td
(5835     microdelay\(200\);) 109.2129 Tj
0 -370.2411 Td
(5836   }) 34.9481 Tj
0 -379.7344 Td
(5837 }) 26.2111 Tj
0 -389.2278 Td
(5838 ) 21.8426 Tj
0 -398.7211 Td
(5839 ) 21.8426 Tj
0 -408.2145 Td
(5840 ) 21.8426 Tj
0 -417.7079 Td
(5841 ) 21.8426 Tj
0 -427.2012 Td
(5842 ) 21.8426 Tj
0 -436.6946 Td
(5843 ) 21.8426 Tj
0 -446.1879 Td
(5844 ) 21.8426 Tj
0 -455.6813 Td
(5845 ) 21.8426 Tj
0 -465.1747 Td
(5846 ) 21.8426 Tj
0 -474.668 Td
(5847 ) 21.8426 Tj
0 -484.1614 Td
(5848 ) 21.8426 Tj
0 -493.6547 Td
(5849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 58) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/ioapic.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(5850 // The I/O APIC manages hardware interrupts for an SMP sys\
tem.) 292.6905 Tj
0 -37.9735 Td
(5851 // http://www.intel.com/design/chipsets/datashts/29056601.\
pdf) 288.322 Tj
0 -47.4668 Td
(5852 // See also picirq.c.) 113.5814 Tj
0 -56.9602 Td
(5853 ) 21.8426 Tj
0 -66.4535 Td
(5854 #include "types.h") 100.4758 Tj
0 -75.9469 Td
(5855 #include "defs.h") 96.1073 Tj
0 -85.4403 Td
(5856 #include "traps.h") 100.4758 Tj
0 -94.9336 Td
(5857 ) 21.8426 Tj
0 -104.427 Td
(5858 #define IOAPIC  0xFEC00000   // Default physical address o\
f IO APIC) 314.533 Tj
0 -113.9203 Td
(5859 ) 21.8426 Tj
0 -123.4137 Td
(5860 #define REG_ID     0x00  // Register index: ID) 222.7942 Tj
0 -132.9071 Td
(5861 #define REG_VER    0x01  // Register index: version) 244.6368 Tj
0 -142.4004 Td
(5862 #define REG_TABLE  0x10  // Redirection table base) 240.2683 Tj
0 -151.8938 Td
(5863 ) 21.8426 Tj
0 -161.3871 Td
(5864 // The redirection table starts at REG_TABLE and uses) 253.3738 Tj
0 -170.8805 Td
(5865 // two registers to configure each interrupt.) 218.4257 Tj
0 -180.3739 Td
(5866 // The first \(low\) register in a pair contains configura\
tion bits.) 310.1645 Tj
0 -189.8672 Td
(5867 // The second \(high\) register contains a bitmask telling\
 which) 292.6905 Tj
0 -199.3606 Td
(5868 // CPUs can serve that interrupt.) 166.0035 Tj
0 -208.8539 Td
(5869 #define INT_DISABLED   0x00010000  // Interrupt disabled) 266.4794 Tj
0 -218.3473 Td
(5870 #define INT_LEVEL      0x00008000  // Level-triggered \(vs\
 edge-\)) 301.4275 Tj
0 -227.8407 Td
(5871 #define INT_ACTIVELOW  0x00002000  // Active low \(vs high\
\)) 275.2164 Tj
0 -237.334 Td
(5872 #define INT_LOGICAL    0x00000800  // Destination is CPU i\
d \(vs APIC ID\)) 336.3756 Tj
0 -246.8274 Td
(5873 ) 21.8426 Tj
0 -256.3207 Td
(5874 volatile struct ioapic *ioapic;) 157.2665 Tj
0 -265.8141 Td
(5875 ) 21.8426 Tj
0 -275.3075 Td
(5876 // IO APIC MMIO structure: write reg, then read or write d\
ata.) 292.6905 Tj
0 -284.8008 Td
(5877 struct ioapic {) 87.3703 Tj
0 -294.2942 Td
(5878   uint reg;) 69.8962 Tj
0 -303.7875 Td
(5879   uint pad[3];) 83.0018 Tj
0 -313.2809 Td
(5880   uint data;) 74.2647 Tj
0 -322.7743 Td
(5881 };) 30.5796 Tj
0 -332.2676 Td
(5882 ) 21.8426 Tj
0 -341.761 Td
(5883 static uint) 69.8962 Tj
0 -351.2543 Td
(5884 ioapic_read\(int reg\)) 109.2129 Tj
0 -360.7477 Td
(5885 {) 26.2111 Tj
0 -370.2411 Td
(5886   ioapic->reg = reg;) 109.2129 Tj
0 -379.7344 Td
(5887   return ioapic->data;) 117.9499 Tj
0 -389.2278 Td
(5888 }) 26.2111 Tj
0 -398.7211 Td
(5889 ) 21.8426 Tj
0 -408.2145 Td
(5890 static void) 69.8962 Tj
0 -417.7079 Td
(5891 ioapic_write\(int reg, uint data\)) 161.635 Tj
0 -427.2012 Td
(5892 {) 26.2111 Tj
0 -436.6946 Td
(5893   ioapic->reg = reg;) 109.2129 Tj
0 -446.1879 Td
(5894   ioapic->data = data;) 117.9499 Tj
0 -455.6813 Td
(5895 }) 26.2111 Tj
0 -465.1747 Td
(5896 ) 21.8426 Tj
0 -474.668 Td
(5897 ) 21.8426 Tj
0 -484.1614 Td
(5898 ) 21.8426 Tj
0 -493.6547 Td
(5899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 58) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 66 66
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/ioapic.c  Page 2) 170.3721 Tj
0 -28.4801 Td
(5900 void) 39.3166 Tj
0 -37.9735 Td
(5901 ioapic_init\(void\)) 96.1073 Tj
0 -47.4668 Td
(5902 {) 26.2111 Tj
0 -56.9602 Td
(5903   int i, id, maxintr;) 113.5814 Tj
0 -66.4535 Td
(5904 ) 21.8426 Tj
0 -75.9469 Td
(5905   if\(!ismp\)) 69.8962 Tj
0 -85.4403 Td
(5906     return;) 69.8962 Tj
0 -94.9336 Td
(5907 ) 21.8426 Tj
0 -104.427 Td
(5908   ioapic = \(volatile struct ioapic*\)IOAPIC;) 209.6887 Tj
0 -113.9203 Td
(5909   maxintr = \(ioapic_read\(REG_VER\) >> 16\) & 0xFF;) 231.5313 Tj
0 -123.4137 Td
(5910   id = ioapic_read\(REG_ID\) >> 24;) 166.0035 Tj
0 -132.9071 Td
(5911   if\(id != ioapic_id\)) 113.5814 Tj
0 -142.4004 Td
(5912     cprintf\("ioapic_init: id isn't equal to ioapic_id; no\
t a MP\\n"\);) 318.9016 Tj
0 -151.8938 Td
(5913 ) 21.8426 Tj
0 -161.3871 Td
(5914   // Mark all interrupts edge-triggered, active high, disa\
bled,) 297.059 Tj
0 -170.8805 Td
(5915   // and not routed to any CPUs.) 161.635 Tj
0 -180.3739 Td
(5916   for\(i = 0; i <= maxintr; i++\){) 161.635 Tj
0 -189.8672 Td
(5917     ioapic_write\(REG_TABLE+2*i, INT_DISABLED | \(IRQ_OFFS\
ET + i\)\);) 305.796 Tj
0 -199.3606 Td
(5918     ioapic_write\(REG_TABLE+2*i+1, 0\);) 183.4776 Tj
0 -208.8539 Td
(5919   }) 34.9481 Tj
0 -218.3473 Td
(5920 }) 26.2111 Tj
0 -227.8407 Td
(5921 ) 21.8426 Tj
0 -237.334 Td
(5922 void) 39.3166 Tj
0 -246.8274 Td
(5923 ioapic_enable\(int irq, int cpunum\)) 170.3721 Tj
0 -256.3207 Td
(5924 {) 26.2111 Tj
0 -265.8141 Td
(5925   if\(!ismp\)) 69.8962 Tj
0 -275.3075 Td
(5926     return;) 69.8962 Tj
0 -284.8008 Td
(5927 ) 21.8426 Tj
0 -294.2942 Td
(5928   // Mark interrupt edge-triggered, active high,) 231.5313 Tj
0 -303.7875 Td
(5929   // enabled, and routed to the given cpunum,) 218.4257 Tj
0 -313.2809 Td
(5930   // which happens to be that cpu's APIC ID.) 214.0572 Tj
0 -322.7743 Td
(5931   ioapic_write\(REG_TABLE+2*irq, IRQ_OFFSET + irq\);) 240.2683 Tj
0 -332.2676 Td
(5932   ioapic_write\(REG_TABLE+2*irq+1, cpunum << 24\);) 231.5313 Tj
0 -341.761 Td
(5933 }) 26.2111 Tj
0 -351.2543 Td
(5934 ) 21.8426 Tj
0 -360.7477 Td
(5935 ) 21.8426 Tj
0 -370.2411 Td
(5936 ) 21.8426 Tj
0 -379.7344 Td
(5937 ) 21.8426 Tj
0 -389.2278 Td
(5938 ) 21.8426 Tj
0 -398.7211 Td
(5939 ) 21.8426 Tj
0 -408.2145 Td
(5940 ) 21.8426 Tj
0 -417.7079 Td
(5941 ) 21.8426 Tj
0 -427.2012 Td
(5942 ) 21.8426 Tj
0 -436.6946 Td
(5943 ) 21.8426 Tj
0 -446.1879 Td
(5944 ) 21.8426 Tj
0 -455.6813 Td
(5945 ) 21.8426 Tj
0 -465.1747 Td
(5946 ) 21.8426 Tj
0 -474.668 Td
(5947 ) 21.8426 Tj
0 -484.1614 Td
(5948 ) 21.8426 Tj
0 -493.6547 Td
(5949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 59) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/picirq.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(5950 // Intel 8259A programmable interrupt controllers.) 240.2683 Tj
0 -37.9735 Td
(5951 ) 21.8426 Tj
0 -47.4668 Td
(5952 #include "types.h") 100.4758 Tj
0 -56.9602 Td
(5953 #include "x86.h") 91.7388 Tj
0 -66.4535 Td
(5954 #include "traps.h") 100.4758 Tj
0 -75.9469 Td
(5955 ) 21.8426 Tj
0 -85.4403 Td
(5956 // I/O Addresses of the two programmable interrupt control\
lers) 292.6905 Tj
0 -94.9336 Td
(5957 #define IO_PIC1         0x20    // Master \(IRQs 0-7\)) 249.0053 Tj
0 -104.427 Td
(5958 #define IO_PIC2         0xA0    // Slave \(IRQs 8-15\)) 249.0053 Tj
0 -113.9203 Td
(5959 ) 21.8426 Tj
0 -123.4137 Td
(5960 #define IRQ_SLAVE       2       // IRQ at which slave conn\
ects to master) 336.3756 Tj
0 -132.9071 Td
(5961 ) 21.8426 Tj
0 -142.4004 Td
(5962 // Current IRQ mask.) 109.2129 Tj
0 -151.8938 Td
(5963 // Initial IRQ mask has interrupt 2 enabled \(for slave 82\
59A\).) 292.6905 Tj
0 -161.3871 Td
(5964 static ushort irqmask = 0xFFFF & ~\(1<<IRQ_SLAVE\);) 235.8998 Tj
0 -170.8805 Td
(5965 ) 21.8426 Tj
0 -180.3739 Td
(5966 static void) 69.8962 Tj
0 -189.8672 Td
(5967 pic_setmask\(ushort mask\)) 126.6869 Tj
0 -199.3606 Td
(5968 {) 26.2111 Tj
0 -208.8539 Td
(5969   irqmask = mask;) 96.1073 Tj
0 -218.3473 Td
(5970   outb\(IO_PIC1+1, mask\);) 126.6869 Tj
0 -227.8407 Td
(5971   outb\(IO_PIC2+1, mask >> 8\);) 148.5295 Tj
0 -237.334 Td
(5972 }) 26.2111 Tj
0 -246.8274 Td
(5973 ) 21.8426 Tj
0 -256.3207 Td
(5974 void) 39.3166 Tj
0 -265.8141 Td
(5975 pic_enable\(int irq\)) 104.8443 Tj
0 -275.3075 Td
(5976 {) 26.2111 Tj
0 -284.8008 Td
(5977   pic_setmask\(irqmask & ~\(1<<irq\)\);) 174.7406 Tj
0 -294.2942 Td
(5978 }) 26.2111 Tj
0 -303.7875 Td
(5979 ) 21.8426 Tj
0 -313.2809 Td
(5980 // Initialize the 8259A interrupt controllers.) 222.7942 Tj
0 -322.7743 Td
(5981 void) 39.3166 Tj
0 -332.2676 Td
(5982 pic_init\(void\)) 83.0018 Tj
0 -341.761 Td
(5983 {) 26.2111 Tj
0 -351.2543 Td
(5984   // mask all interrupts) 126.6869 Tj
0 -360.7477 Td
(5985   outb\(IO_PIC1+1, 0xFF\);) 126.6869 Tj
0 -370.2411 Td
(5986   outb\(IO_PIC2+1, 0xFF\);) 126.6869 Tj
0 -379.7344 Td
(5987 ) 21.8426 Tj
0 -389.2278 Td
(5988   // Set up master \(8259A-1\)) 144.161 Tj
0 -398.7211 Td
(5989 ) 21.8426 Tj
0 -408.2145 Td
(5990   // ICW1:  0001g0hi) 109.2129 Tj
0 -417.7079 Td
(5991   //    g:  0 = edge triggering, 1 = level triggering) 253.3738 Tj
0 -427.2012 Td
(5992   //    h:  0 = cascaded PICs, 1 = master only) 222.7942 Tj
0 -436.6946 Td
(5993   //    i:  0 = no ICW4, 1 = ICW4 required) 205.3202 Tj
0 -446.1879 Td
(5994   outb\(IO_PIC1, 0x11\);) 117.9499 Tj
0 -455.6813 Td
(5995 ) 21.8426 Tj
0 -465.1747 Td
(5996   // ICW2:  Vector offset) 131.0554 Tj
0 -474.668 Td
(5997   outb\(IO_PIC1+1, IRQ_OFFSET\);) 152.898 Tj
0 -484.1614 Td
(5998 ) 21.8426 Tj
0 -493.6547 Td
(5999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 59) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 67 67
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/picirq.c  Page 2) 170.3721 Tj
0 -28.4801 Td
(6000   // ICW3:  \(master PIC\) bit mask of IR lines connected \
to slaves) 305.796 Tj
0 -37.9735 Td
(6001   //        \(slave PIC\) 3-bit # of slave's connection to\
 master) 297.059 Tj
0 -47.4668 Td
(6002   outb\(IO_PIC1+1, 1<<IRQ_SLAVE\);) 161.635 Tj
0 -56.9602 Td
(6003 ) 21.8426 Tj
0 -66.4535 Td
(6004   // ICW4:  000nbmap) 109.2129 Tj
0 -75.9469 Td
(6005   //    n:  1 = special fully nested mode) 200.9517 Tj
0 -85.4403 Td
(6006   //    b:  1 = buffered mode) 148.5295 Tj
0 -94.9336 Td
(6007   //    m:  0 = slave PIC, 1 = master PIC) 200.9517 Tj
0 -104.427 Td
(6008   //      \(ignored when b is 0, as the master/slave role) 266.4794 Tj
0 -113.9203 Td
(6009   //      can be hardwired\).) 144.161 Tj
0 -123.4137 Td
(6010   //    a:  1 = Automatic EOI mode) 170.3721 Tj
0 -132.9071 Td
(6011   //    p:  0 = MCS-80/85 mode, 1 = intel x86 mode) 240.2683 Tj
0 -142.4004 Td
(6012   outb\(IO_PIC1+1, 0x3\);) 122.3184 Tj
0 -151.8938 Td
(6013 ) 21.8426 Tj
0 -161.3871 Td
(6014   // Set up slave \(8259A-2\)) 139.7925 Tj
0 -170.8805 Td
(6015   outb\(IO_PIC2, 0x11\);                  // ICW1) 227.1628 Tj
0 -180.3739 Td
(6016   outb\(IO_PIC2+1, IRQ_OFFSET + 8\);      // ICW2) 227.1628 Tj
0 -189.8672 Td
(6017   outb\(IO_PIC2+1, IRQ_SLAVE\);           // ICW3) 227.1628 Tj
0 -199.3606 Td
(6018   // NB Automatic EOI mode doesn't tend to work on the sla\
ve.) 288.322 Tj
0 -208.8539 Td
(6019   // Linux source code says it's "to be investigated".) 257.7424 Tj
0 -218.3473 Td
(6020   outb\(IO_PIC2+1, 0x3\);                 // ICW4) 227.1628 Tj
0 -227.8407 Td
(6021 ) 21.8426 Tj
0 -237.334 Td
(6022   // OCW3:  0ef01prs) 109.2129 Tj
0 -246.8274 Td
(6023   //   ef:  0x = NOP, 10 = clear specific mask, 11 = set s\
pecific mask) 327.6386 Tj
0 -256.3207 Td
(6024   //    p:  0 = no polling, 1 = polling mode) 214.0572 Tj
0 -265.8141 Td
(6025   //   rs:  0x = NOP, 10 = read IRR, 11 = read ISR) 240.2683 Tj
0 -275.3075 Td
(6026   outb\(IO_PIC1, 0x68\);             // clear specific mas\
k) 270.8479 Tj
0 -284.8008 Td
(6027   outb\(IO_PIC1, 0x0a\);             // read IRR by defaul\
t) 270.8479 Tj
0 -294.2942 Td
(6028 ) 21.8426 Tj
0 -303.7875 Td
(6029   outb\(IO_PIC2, 0x68\);             // OCW3) 205.3202 Tj
0 -313.2809 Td
(6030   outb\(IO_PIC2, 0x0a\);             // OCW3) 205.3202 Tj
0 -322.7743 Td
(6031 ) 21.8426 Tj
0 -332.2676 Td
(6032   if\(irqmask != 0xFFFF\)) 122.3184 Tj
0 -341.761 Td
(6033     pic_setmask\(irqmask\);) 131.0554 Tj
0 -351.2543 Td
(6034 }) 26.2111 Tj
0 -360.7477 Td
(6035 ) 21.8426 Tj
0 -370.2411 Td
(6036 ) 21.8426 Tj
0 -379.7344 Td
(6037 ) 21.8426 Tj
0 -389.2278 Td
(6038 ) 21.8426 Tj
0 -398.7211 Td
(6039 ) 21.8426 Tj
0 -408.2145 Td
(6040 ) 21.8426 Tj
0 -417.7079 Td
(6041 ) 21.8426 Tj
0 -427.2012 Td
(6042 ) 21.8426 Tj
0 -436.6946 Td
(6043 ) 21.8426 Tj
0 -446.1879 Td
(6044 ) 21.8426 Tj
0 -455.6813 Td
(6045 ) 21.8426 Tj
0 -465.1747 Td
(6046 ) 21.8426 Tj
0 -474.668 Td
(6047 ) 21.8426 Tj
0 -484.1614 Td
(6048 ) 21.8426 Tj
0 -493.6547 Td
(6049 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 60) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/kbd.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(6050 // PC keyboard interface constants) 170.3721 Tj
0 -37.9735 Td
(6051 ) 21.8426 Tj
0 -47.4668 Td
(6052 #define KBSTATP         0x64    // kbd controller status p\
ort\(I\)) 301.4275 Tj
0 -56.9602 Td
(6053 #define KBS_DIB         0x01    // kbd data in buffer) 253.3738 Tj
0 -66.4535 Td
(6054 #define KBDATAP         0x60    // kbd data port\(I\)) 244.6368 Tj
0 -75.9469 Td
(6055 ) 21.8426 Tj
0 -85.4403 Td
(6056 #define NO              0) 131.0554 Tj
0 -94.9336 Td
(6057 ) 21.8426 Tj
0 -104.427 Td
(6058 #define SHIFT           \(1<<0\)) 152.898 Tj
0 -113.9203 Td
(6059 #define CTL             \(1<<1\)) 152.898 Tj
0 -123.4137 Td
(6060 #define ALT             \(1<<2\)) 152.898 Tj
0 -132.9071 Td
(6061 ) 21.8426 Tj
0 -142.4004 Td
(6062 #define CAPSLOCK        \(1<<3\)) 152.898 Tj
0 -151.8938 Td
(6063 #define NUMLOCK         \(1<<4\)) 152.898 Tj
0 -161.3871 Td
(6064 #define SCROLLLOCK      \(1<<5\)) 152.898 Tj
0 -170.8805 Td
(6065 ) 21.8426 Tj
0 -180.3739 Td
(6066 #define E0ESC           \(1<<6\)) 152.898 Tj
0 -189.8672 Td
(6067 ) 21.8426 Tj
0 -199.3606 Td
(6068 // Special keycodes) 104.8443 Tj
0 -208.8539 Td
(6069 #define KEY_HOME        0xE0) 144.161 Tj
0 -218.3473 Td
(6070 #define KEY_END         0xE1) 144.161 Tj
0 -227.8407 Td
(6071 #define KEY_UP          0xE2) 144.161 Tj
0 -237.334 Td
(6072 #define KEY_DN          0xE3) 144.161 Tj
0 -246.8274 Td
(6073 #define KEY_LF          0xE4) 144.161 Tj
0 -256.3207 Td
(6074 #define KEY_RT          0xE5) 144.161 Tj
0 -265.8141 Td
(6075 #define KEY_PGUP        0xE6) 144.161 Tj
0 -275.3075 Td
(6076 #define KEY_PGDN        0xE7) 144.161 Tj
0 -284.8008 Td
(6077 #define KEY_INS         0xE8) 144.161 Tj
0 -294.2942 Td
(6078 #define KEY_DEL         0xE9) 144.161 Tj
0 -303.7875 Td
(6079 ) 21.8426 Tj
0 -313.2809 Td
(6080 // C\('A'\) == Control-A) 117.9499 Tj
0 -322.7743 Td
(6081 #define C\(x\) \(x - '@'\)) 117.9499 Tj
0 -332.2676 Td
(6082 ) 21.8426 Tj
0 -341.761 Td
(6083 static uchar shiftcode[256] =) 148.5295 Tj
0 -351.2543 Td
(6084 {) 26.2111 Tj
0 -360.7477 Td
(6085   [0x1D] CTL,) 78.6333 Tj
0 -370.2411 Td
(6086   [0x2A] SHIFT,) 87.3703 Tj
0 -379.7344 Td
(6087   [0x36] SHIFT,) 87.3703 Tj
0 -389.2278 Td
(6088   [0x38] ALT,) 78.6333 Tj
0 -398.7211 Td
(6089   [0x9D] CTL,) 78.6333 Tj
0 -408.2145 Td
(6090   [0xB8] ALT) 74.2647 Tj
0 -417.7079 Td
(6091 };) 30.5796 Tj
0 -427.2012 Td
(6092 ) 21.8426 Tj
0 -436.6946 Td
(6093 static uchar togglecode[256] =) 152.898 Tj
0 -446.1879 Td
(6094 {) 26.2111 Tj
0 -455.6813 Td
(6095   [0x3A] CAPSLOCK,) 100.4758 Tj
0 -465.1747 Td
(6096   [0x45] NUMLOCK,) 96.1073 Tj
0 -474.668 Td
(6097   [0x46] SCROLLLOCK) 104.8443 Tj
0 -484.1614 Td
(6098 };) 30.5796 Tj
0 -493.6547 Td
(6099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 60) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/kbd.h  Page 2) 157.2665 Tj
0 -28.4801 Td
(6100 static uchar normalmap[256] =) 148.5295 Tj
0 -37.9735 Td
(6101 {) 26.2111 Tj
0 -47.4668 Td
(6102   NO,   0x1B, '1',  '2',  '3',  '4',  '5',  '6',  // 0x00) 270.8479 Tj
0 -56.9602 Td
(6103   '7',  '8',  '9',  '0',  '-',  '=',  '\\b', '\\t',) 235.8998 Tj
0 -66.4535 Td
(6104   'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',  // 0x10) 270.8479 Tj
0 -75.9469 Td
(6105   'o',  'p',  '[',  ']',  '\\n', NO,   'a',  's',) 231.5313 Tj
0 -85.4403 Td
(6106   'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';',  // 0x20) 270.8479 Tj
0 -94.9336 Td
(6107   '\\'', '`',  NO,   '\\\\', 'z',  'x',  'c',  'v',) 231.5313 Tj
0 -104.427 Td
(6108   'b',  'n',  'm',  ',',  '.',  '/',  NO,   '*',  // 0x30) 270.8479 Tj
0 -113.9203 Td
(6109   NO,   ' ',  NO,   NO,   NO,   NO,   NO,   NO,) 227.1628 Tj
0 -123.4137 Td
(6110   NO,   NO,   NO,   NO,   NO,   NO,   NO,   '7',  // 0x40) 270.8479 Tj
0 -132.9071 Td
(6111   '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',) 231.5313 Tj
0 -142.4004 Td
(6112   '2',  '3',  '0',  '.',  NO,   NO,   NO,   NO,   // 0x50) 270.8479 Tj
0 -151.8938 Td
(6113   [0x9C] '\\n',      // KP_Enter) 157.2665 Tj
0 -161.3871 Td
(6114   [0xB5] '/',       // KP_Div) 148.5295 Tj
0 -170.8805 Td
(6115   [0xC8] KEY_UP,    [0xD0] KEY_DN,) 170.3721 Tj
0 -180.3739 Td
(6116   [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,) 179.1091 Tj
0 -189.8672 Td
(6117   [0xCB] KEY_LF,    [0xCD] KEY_RT,) 170.3721 Tj
0 -199.3606 Td
(6118   [0x97] KEY_HOME,  [0xCF] KEY_END,) 174.7406 Tj
0 -208.8539 Td
(6119   [0xD2] KEY_INS,   [0xD3] KEY_DEL) 170.3721 Tj
0 -218.3473 Td
(6120 };) 30.5796 Tj
0 -227.8407 Td
(6121 ) 21.8426 Tj
0 -237.334 Td
(6122 static uchar shiftmap[256] =) 144.161 Tj
0 -246.8274 Td
(6123 {) 26.2111 Tj
0 -256.3207 Td
(6124   NO,   033,  '!',  '@',  '#',  '$',  '%',  '^',  // 0x00) 270.8479 Tj
0 -265.8141 Td
(6125   '&',  '*',  '\(',  '\)',  '_',  '+',  '\\b', '\\t',) 235.8998 Tj
0 -275.3075 Td
(6126   'Q',  'W',  'E',  'R',  'T',  'Y',  'U',  'I',  // 0x10) 270.8479 Tj
0 -284.8008 Td
(6127   'O',  'P',  '{',  '}',  '\\n', NO,   'A',  'S',) 231.5313 Tj
0 -294.2942 Td
(6128   'D',  'F',  'G',  'H',  'J',  'K',  'L',  ':',  // 0x20) 270.8479 Tj
0 -303.7875 Td
(6129   '"',  '~',  NO,   '|',  'Z',  'X',  'C',  'V',) 231.5313 Tj
0 -313.2809 Td
(6130   'B',  'N',  'M',  '<',  '>',  '?',  NO,   '*',  // 0x30) 270.8479 Tj
0 -322.7743 Td
(6131   NO,   ' ',  NO,   NO,   NO,   NO,   NO,   NO,) 227.1628 Tj
0 -332.2676 Td
(6132   NO,   NO,   NO,   NO,   NO,   NO,   NO,   '7',  // 0x40) 270.8479 Tj
0 -341.761 Td
(6133   '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',) 231.5313 Tj
0 -351.2543 Td
(6134   '2',  '3',  '0',  '.',  NO,   NO,   NO,   NO,   // 0x50) 270.8479 Tj
0 -360.7477 Td
(6135   [0x9C] '\\n',      // KP_Enter) 157.2665 Tj
0 -370.2411 Td
(6136   [0xB5] '/',       // KP_Div) 148.5295 Tj
0 -379.7344 Td
(6137   [0xC8] KEY_UP,    [0xD0] KEY_DN,) 170.3721 Tj
0 -389.2278 Td
(6138   [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,) 179.1091 Tj
0 -398.7211 Td
(6139   [0xCB] KEY_LF,    [0xCD] KEY_RT,) 170.3721 Tj
0 -408.2145 Td
(6140   [0x97] KEY_HOME,  [0xCF] KEY_END,) 174.7406 Tj
0 -417.7079 Td
(6141   [0xD2] KEY_INS,   [0xD3] KEY_DEL) 170.3721 Tj
0 -427.2012 Td
(6142 };) 30.5796 Tj
0 -436.6946 Td
(6143 ) 21.8426 Tj
0 -446.1879 Td
(6144 ) 21.8426 Tj
0 -455.6813 Td
(6145 ) 21.8426 Tj
0 -465.1747 Td
(6146 ) 21.8426 Tj
0 -474.668 Td
(6147 ) 21.8426 Tj
0 -484.1614 Td
(6148 ) 21.8426 Tj
0 -493.6547 Td
(6149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 61) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/kbd.h  Page 3) 157.2665 Tj
0 -28.4801 Td
(6150 static uchar ctlmap[256] =) 135.4239 Tj
0 -37.9735 Td
(6151 {) 26.2111 Tj
0 -47.4668 Td
(6152   NO,      NO,      NO,      NO,      NO,      NO,      NO\
,      NO,) 318.9016 Tj
0 -56.9602 Td
(6153   NO,      NO,      NO,      NO,      NO,      NO,      NO\
,      NO,) 318.9016 Tj
0 -66.4535 Td
(6154   C\('Q'\),  C\('W'\),  C\('E'\),  C\('R'\),  C\('T'\),  C\
\('Y'\),  C\('U'\),  C\('I'\),) 336.3756 Tj
0 -75.9469 Td
(6155   C\('O'\),  C\('P'\),  NO,      NO,      '\\r',    NO,   \
   C\('A'\),  C\('S'\),) 336.3756 Tj
0 -85.4403 Td
(6156   C\('D'\),  C\('F'\),  C\('G'\),  C\('H'\),  C\('J'\),  C\
\('K'\),  C\('L'\),  NO,) 318.9016 Tj
0 -94.9336 Td
(6157   NO,      NO,      NO,      C\('\\\\'\), C\('Z'\),  C\('X\
'\),  C\('C'\),  C\('V'\),) 336.3756 Tj
0 -104.427 Td
(6158   C\('B'\),  C\('N'\),  C\('M'\),  NO,      NO,      C\('/\
'\),  NO,      NO,) 318.9016 Tj
0 -113.9203 Td
(6159   [0x9C] '\\r',      // KP_Enter) 157.2665 Tj
0 -123.4137 Td
(6160   [0xB5] C\('/'\),    // KP_Div) 148.5295 Tj
0 -132.9071 Td
(6161   [0xC8] KEY_UP,    [0xD0] KEY_DN,) 170.3721 Tj
0 -142.4004 Td
(6162   [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,) 179.1091 Tj
0 -151.8938 Td
(6163   [0xCB] KEY_LF,    [0xCD] KEY_RT,) 170.3721 Tj
0 -161.3871 Td
(6164   [0x97] KEY_HOME,  [0xCF] KEY_END,) 174.7406 Tj
0 -170.8805 Td
(6165   [0xD2] KEY_INS,   [0xD3] KEY_DEL) 170.3721 Tj
0 -180.3739 Td
(6166 };) 30.5796 Tj
0 -189.8672 Td
(6167 ) 21.8426 Tj
0 -199.3606 Td
(6168 ) 21.8426 Tj
0 -208.8539 Td
(6169 ) 21.8426 Tj
0 -218.3473 Td
(6170 ) 21.8426 Tj
0 -227.8407 Td
(6171 ) 21.8426 Tj
0 -237.334 Td
(6172 ) 21.8426 Tj
0 -246.8274 Td
(6173 ) 21.8426 Tj
0 -256.3207 Td
(6174 ) 21.8426 Tj
0 -265.8141 Td
(6175 ) 21.8426 Tj
0 -275.3075 Td
(6176 ) 21.8426 Tj
0 -284.8008 Td
(6177 ) 21.8426 Tj
0 -294.2942 Td
(6178 ) 21.8426 Tj
0 -303.7875 Td
(6179 ) 21.8426 Tj
0 -313.2809 Td
(6180 ) 21.8426 Tj
0 -322.7743 Td
(6181 ) 21.8426 Tj
0 -332.2676 Td
(6182 ) 21.8426 Tj
0 -341.761 Td
(6183 ) 21.8426 Tj
0 -351.2543 Td
(6184 ) 21.8426 Tj
0 -360.7477 Td
(6185 ) 21.8426 Tj
0 -370.2411 Td
(6186 ) 21.8426 Tj
0 -379.7344 Td
(6187 ) 21.8426 Tj
0 -389.2278 Td
(6188 ) 21.8426 Tj
0 -398.7211 Td
(6189 ) 21.8426 Tj
0 -408.2145 Td
(6190 ) 21.8426 Tj
0 -417.7079 Td
(6191 ) 21.8426 Tj
0 -427.2012 Td
(6192 ) 21.8426 Tj
0 -436.6946 Td
(6193 ) 21.8426 Tj
0 -446.1879 Td
(6194 ) 21.8426 Tj
0 -455.6813 Td
(6195 ) 21.8426 Tj
0 -465.1747 Td
(6196 ) 21.8426 Tj
0 -474.668 Td
(6197 ) 21.8426 Tj
0 -484.1614 Td
(6198 ) 21.8426 Tj
0 -493.6547 Td
(6199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 61) 34.9481 Tj
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0 0 612 792 re W
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[] 0 d
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(Sep  3 10:05 2008  xv6/kbd.c  Page 1) 157.2665 Tj
0 -28.4801 Td
(6200 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(6201 #include "x86.h") 91.7388 Tj
0 -47.4668 Td
(6202 #include "defs.h") 96.1073 Tj
0 -56.9602 Td
(6203 #include "kbd.h") 91.7388 Tj
0 -66.4535 Td
(6204 ) 21.8426 Tj
0 -75.9469 Td
(6205 int) 34.9481 Tj
0 -85.4403 Td
(6206 kbd_getc\(void\)) 83.0018 Tj
0 -94.9336 Td
(6207 {) 26.2111 Tj
0 -104.427 Td
(6208   static uint shift;) 109.2129 Tj
0 -113.9203 Td
(6209   static uchar *charcode[4] = {) 157.2665 Tj
0 -123.4137 Td
(6210     normalmap, shiftmap, ctlmap, ctlmap) 192.2146 Tj
0 -132.9071 Td
(6211   };) 39.3166 Tj
0 -142.4004 Td
(6212   uint st, data, c;) 104.8443 Tj
0 -151.8938 Td
(6213 ) 21.8426 Tj
0 -161.3871 Td
(6214   st = inb\(KBSTATP\);) 109.2129 Tj
0 -170.8805 Td
(6215   if\(\(st & KBS_DIB\) == 0\)) 131.0554 Tj
0 -180.3739 Td
(6216     return -1;) 83.0018 Tj
0 -189.8672 Td
(6217   data = inb\(KBDATAP\);) 117.9499 Tj
0 -199.3606 Td
(6218 ) 21.8426 Tj
0 -208.8539 Td
(6219   if\(data == 0xE0\){) 104.8443 Tj
0 -218.3473 Td
(6220     shift |= E0ESC;) 104.8443 Tj
0 -227.8407 Td
(6221     return 0;) 78.6333 Tj
0 -237.334 Td
(6222   } else if\(data & 0x80\){) 131.0554 Tj
0 -246.8274 Td
(6223     // Key released) 104.8443 Tj
0 -256.3207 Td
(6224     data = \(shift & E0ESC ? data : data & 0x7F\);) 231.5313 Tj
0 -265.8141 Td
(6225     shift &= ~\(shiftcode[data] | E0ESC\);) 196.5831 Tj
0 -275.3075 Td
(6226     return 0;) 78.6333 Tj
0 -284.8008 Td
(6227   } else if\(shift & E0ESC\){) 139.7925 Tj
0 -294.2942 Td
(6228     // Last character was an E0 escape; or with 0x80) 249.0053 Tj
0 -303.7875 Td
(6229     data |= 0x80;) 96.1073 Tj
0 -313.2809 Td
(6230     shift &= ~E0ESC;) 109.2129 Tj
0 -322.7743 Td
(6231   }) 34.9481 Tj
0 -332.2676 Td
(6232 ) 21.8426 Tj
0 -341.761 Td
(6233   shift |= shiftcode[data];) 139.7925 Tj
0 -351.2543 Td
(6234   shift ^= togglecode[data];) 144.161 Tj
0 -360.7477 Td
(6235   c = charcode[shift & \(CTL | SHIFT\)][data];) 214.0572 Tj
0 -370.2411 Td
(6236   if\(shift & CAPSLOCK\){) 122.3184 Tj
0 -379.7344 Td
(6237     if\('a' <= c && c <= 'z'\)) 144.161 Tj
0 -389.2278 Td
(6238       c += 'A' - 'a';) 113.5814 Tj
0 -398.7211 Td
(6239     else if\('A' <= c && c <= 'Z'\)) 166.0035 Tj
0 -408.2145 Td
(6240       c += 'a' - 'A';) 113.5814 Tj
0 -417.7079 Td
(6241   }) 34.9481 Tj
0 -427.2012 Td
(6242   return c;) 69.8962 Tj
0 -436.6946 Td
(6243 }) 26.2111 Tj
0 -446.1879 Td
(6244 ) 21.8426 Tj
0 -455.6813 Td
(6245 void) 39.3166 Tj
0 -465.1747 Td
(6246 kbd_intr\(void\)) 83.0018 Tj
0 -474.668 Td
(6247 {) 26.2111 Tj
0 -484.1614 Td
(6248   console_intr\(kbd_getc\);) 131.0554 Tj
0 -493.6547 Td
(6249 }) 26.2111 Tj
0 -522.1348 Td
(Sheet 62) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/console.c  Page 1) 174.7406 Tj
0 -28.4801 Td
(6250 // Console input and output.) 144.161 Tj
0 -37.9735 Td
(6251 // Input is from the keyboard only.) 174.7406 Tj
0 -47.4668 Td
(6252 // Output is written to the screen and the printer port.) 266.4794 Tj
0 -56.9602 Td
(6253 ) 21.8426 Tj
0 -66.4535 Td
(6254 #include "types.h") 100.4758 Tj
0 -75.9469 Td
(6255 #include "defs.h") 96.1073 Tj
0 -85.4403 Td
(6256 #include "param.h") 100.4758 Tj
0 -94.9336 Td
(6257 #include "traps.h") 100.4758 Tj
0 -104.427 Td
(6258 #include "spinlock.h") 113.5814 Tj
0 -113.9203 Td
(6259 #include "dev.h") 91.7388 Tj
0 -123.4137 Td
(6260 #include "mmu.h") 91.7388 Tj
0 -132.9071 Td
(6261 #include "proc.h") 96.1073 Tj
0 -142.4004 Td
(6262 #include "x86.h") 91.7388 Tj
0 -151.8938 Td
(6263 ) 21.8426 Tj
0 -161.3871 Td
(6264 #define CRTPORT 0x3d4) 113.5814 Tj
0 -170.8805 Td
(6265 #define LPTPORT 0x378) 113.5814 Tj
0 -180.3739 Td
(6266 #define BACKSPACE 0x100) 122.3184 Tj
0 -189.8672 Td
(6267 ) 21.8426 Tj
0 -199.3606 Td
(6268 static ushort *crt = \(ushort*\)0xb8000;  // CGA memory) 253.3738 Tj
0 -208.8539 Td
(6269 ) 21.8426 Tj
0 -218.3473 Td
(6270 static struct spinlock console_lock;) 179.1091 Tj
0 -227.8407 Td
(6271 int panicked = 0;) 96.1073 Tj
0 -237.334 Td
(6272 int use_console_lock = 0;) 131.0554 Tj
0 -246.8274 Td
(6273 ) 21.8426 Tj
0 -256.3207 Td
(6274 // Copy console output to parallel port, which you can tel\
l) 279.5849 Tj
0 -265.8141 Td
(6275 // .bochsrc to copy to the stdout:) 170.3721 Tj
0 -275.3075 Td
(6276 //   parport1: enabled=1, file="/dev/stdout") 214.0572 Tj
0 -284.8008 Td
(6277 static void) 69.8962 Tj
0 -294.2942 Td
(6278 lpt_putc\(int c\)) 87.3703 Tj
0 -303.7875 Td
(6279 {) 26.2111 Tj
0 -313.2809 Td
(6280   int i;) 56.7907 Tj
0 -322.7743 Td
(6281 ) 21.8426 Tj
0 -332.2676 Td
(6282   for\(i = 0; !\(inb\(LPTPORT+1\) & 0x80\) && i < 12800; i\
++\)) 266.4794 Tj
0 -341.761 Td
(6283     ;) 43.6851 Tj
0 -351.2543 Td
(6284   if\(c == BACKSPACE\)) 109.2129 Tj
0 -360.7477 Td
(6285     c = '\\b';) 78.6333 Tj
0 -370.2411 Td
(6286   outb\(LPTPORT+0, c\);) 113.5814 Tj
0 -379.7344 Td
(6287   outb\(LPTPORT+2, 0x08|0x04|0x01\);) 170.3721 Tj
0 -389.2278 Td
(6288   outb\(LPTPORT+2, 0x08\);) 126.6869 Tj
0 -398.7211 Td
(6289 }) 26.2111 Tj
0 -408.2145 Td
(6290 ) 21.8426 Tj
0 -417.7079 Td
(6291 ) 21.8426 Tj
0 -427.2012 Td
(6292 ) 21.8426 Tj
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(6293 ) 21.8426 Tj
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(6294 ) 21.8426 Tj
0 -455.6813 Td
(6295 ) 21.8426 Tj
0 -465.1747 Td
(6296 ) 21.8426 Tj
0 -474.668 Td
(6297 ) 21.8426 Tj
0 -484.1614 Td
(6298 ) 21.8426 Tj
0 -493.6547 Td
(6299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 62) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/console.c  Page 2) 174.7406 Tj
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(6300 static void) 69.8962 Tj
0 -37.9735 Td
(6301 cga_putc\(int c\)) 87.3703 Tj
0 -47.4668 Td
(6302 {) 26.2111 Tj
0 -56.9602 Td
(6303   int pos;) 65.5277 Tj
0 -66.4535 Td
(6304 ) 21.8426 Tj
0 -75.9469 Td
(6305   // Cursor position: col + 80*row.) 174.7406 Tj
0 -85.4403 Td
(6306   outb\(CRTPORT, 14\);) 109.2129 Tj
0 -94.9336 Td
(6307   pos = inb\(CRTPORT+1\) << 8;) 144.161 Tj
0 -104.427 Td
(6308   outb\(CRTPORT, 15\);) 109.2129 Tj
0 -113.9203 Td
(6309   pos |= inb\(CRTPORT+1\);) 126.6869 Tj
0 -123.4137 Td
(6310 ) 21.8426 Tj
0 -132.9071 Td
(6311   if\(c == '\\n'\)) 87.3703 Tj
0 -142.4004 Td
(6312     pos += 80 - pos%80;) 122.3184 Tj
0 -151.8938 Td
(6313   else if\(c == BACKSPACE\){) 135.4239 Tj
0 -161.3871 Td
(6314     if\(pos > 0\)) 87.3703 Tj
0 -170.8805 Td
(6315       crt[--pos] = ' ' | 0x0700;) 161.635 Tj
0 -180.3739 Td
(6316   } else) 56.7907 Tj
0 -189.8672 Td
(6317     crt[pos++] = \(c&0xff\) | 0x0700;  // black on white) 257.7424 Tj
0 -199.3606 Td
(6318 ) 21.8426 Tj
0 -208.8539 Td
(6319   if\(\(pos/80\) >= 24\){  // Scroll up.) 179.1091 Tj
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(6320     memmove\(crt, crt+80, sizeof\(crt[0]\)*23*80\);) 227.1628 Tj
0 -227.8407 Td
(6321     pos -= 80;) 83.0018 Tj
0 -237.334 Td
(6322     memset\(crt+pos, 0, sizeof\(crt[0]\)*\(24*80 - pos\)\)\
;) 253.3738 Tj
0 -246.8274 Td
(6323   }) 34.9481 Tj
0 -256.3207 Td
(6324 ) 21.8426 Tj
0 -265.8141 Td
(6325   outb\(CRTPORT, 14\);) 109.2129 Tj
0 -275.3075 Td
(6326   outb\(CRTPORT+1, pos>>8\);) 135.4239 Tj
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(6327   outb\(CRTPORT, 15\);) 109.2129 Tj
0 -294.2942 Td
(6328   outb\(CRTPORT+1, pos\);) 122.3184 Tj
0 -303.7875 Td
(6329   crt[pos] = ' ' | 0x0700;) 135.4239 Tj
0 -313.2809 Td
(6330 }) 26.2111 Tj
0 -322.7743 Td
(6331 ) 21.8426 Tj
0 -332.2676 Td
(6332 void) 39.3166 Tj
0 -341.761 Td
(6333 cons_putc\(int c\)) 91.7388 Tj
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(6334 {) 26.2111 Tj
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(6335   if\(panicked\){) 87.3703 Tj
0 -370.2411 Td
(6336     cli\(\);) 65.5277 Tj
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(6337     for\(;;\)) 69.8962 Tj
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(6338       ;) 52.4222 Tj
0 -398.7211 Td
(6339   }) 34.9481 Tj
0 -408.2145 Td
(6340 ) 21.8426 Tj
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(6341   lpt_putc\(c\);) 83.0018 Tj
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(6342   cga_putc\(c\);) 83.0018 Tj
0 -436.6946 Td
(6343 }) 26.2111 Tj
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(6344 ) 21.8426 Tj
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(6345 ) 21.8426 Tj
0 -465.1747 Td
(6346 ) 21.8426 Tj
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(6347 ) 21.8426 Tj
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(6348 ) 21.8426 Tj
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(6349 ) 21.8426 Tj
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(Sheet 63) 34.9481 Tj
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180 500 5760 3460 re
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[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
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[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/console.c  Page 3) 174.7406 Tj
0 -28.4801 Td
(6350 void) 39.3166 Tj
0 -37.9735 Td
(6351 printint\(int xx, int base, int sgn\)) 174.7406 Tj
0 -47.4668 Td
(6352 {) 26.2111 Tj
0 -56.9602 Td
(6353   static char digits[] = "0123456789ABCDEF";) 214.0572 Tj
0 -66.4535 Td
(6354   char buf[16];) 87.3703 Tj
0 -75.9469 Td
(6355   int i = 0, neg = 0;) 113.5814 Tj
0 -85.4403 Td
(6356   uint x;) 61.1592 Tj
0 -94.9336 Td
(6357 ) 21.8426 Tj
0 -104.427 Td
(6358   if\(sgn && xx < 0\){) 109.2129 Tj
0 -113.9203 Td
(6359     neg = 1;) 74.2647 Tj
0 -123.4137 Td
(6360     x = 0 - xx;) 87.3703 Tj
0 -132.9071 Td
(6361   } else {) 65.5277 Tj
0 -142.4004 Td
(6362     x = xx;) 69.8962 Tj
0 -151.8938 Td
(6363   }) 34.9481 Tj
0 -161.3871 Td
(6364 ) 21.8426 Tj
0 -170.8805 Td
(6365   do{) 43.6851 Tj
0 -180.3739 Td
(6366     buf[i++] = digits[x % base];) 161.635 Tj
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(6367   }while\(\(x /= base\) != 0\);) 139.7925 Tj
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(6368   if\(neg\)) 61.1592 Tj
0 -208.8539 Td
(6369     buf[i++] = '-';) 104.8443 Tj
0 -218.3473 Td
(6370 ) 21.8426 Tj
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(6371   while\(--i >= 0\)) 96.1073 Tj
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0 -246.8274 Td
(6373 }) 26.2111 Tj
0 -256.3207 Td
(6374 ) 21.8426 Tj
0 -265.8141 Td
(6375 // Print to the console. only understands %d, %x, %p, %s.) 270.8479 Tj
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(6377 cprintf\(char *fmt, ...\)) 122.3184 Tj
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(6382 ) 21.8426 Tj
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(6383   locking = use_console_lock;) 148.5295 Tj
0 -351.2543 Td
(6384   if\(locking\)) 78.6333 Tj
0 -360.7477 Td
(6385     acquire\(&console_lock\);) 139.7925 Tj
0 -370.2411 Td
(6386 ) 21.8426 Tj
0 -379.7344 Td
(6387   argp = \(uint*\)\(void*\)&fmt + 1;) 161.635 Tj
0 -389.2278 Td
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(6389   for\(i = 0; fmt[i]; i++\){) 135.4239 Tj
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(6390     c = fmt[i] & 0xff;) 117.9499 Tj
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(6391     switch\(state\){) 100.4758 Tj
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(6392     case 0:) 69.8962 Tj
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(6393       if\(c == '%'\)) 100.4758 Tj
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(6394         state = '%';) 109.2129 Tj
0 -455.6813 Td
(6395       else) 65.5277 Tj
0 -465.1747 Td
(6396         cons_putc\(c\);) 113.5814 Tj
0 -474.668 Td
(6397       break;) 74.2647 Tj
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(6398 ) 21.8426 Tj
0 -493.6547 Td
(6399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 63) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/console.c  Page 4) 174.7406 Tj
0 -28.4801 Td
(6400     case '%':) 78.6333 Tj
0 -37.9735 Td
(6401       switch\(c\){) 91.7388 Tj
0 -47.4668 Td
(6402       case 'd':) 87.3703 Tj
0 -56.9602 Td
(6403         printint\(*argp++, 10, 1\);) 166.0035 Tj
0 -66.4535 Td
(6404         break;) 83.0018 Tj
0 -75.9469 Td
(6405       case 'x':) 87.3703 Tj
0 -85.4403 Td
(6406       case 'p':) 87.3703 Tj
0 -94.9336 Td
(6407         printint\(*argp++, 16, 0\);) 166.0035 Tj
0 -104.427 Td
(6408         break;) 83.0018 Tj
0 -113.9203 Td
(6409       case 's':) 87.3703 Tj
0 -123.4137 Td
(6410         s = \(char*\)*argp++;) 139.7925 Tj
0 -132.9071 Td
(6411         if\(s == 0\)) 100.4758 Tj
0 -142.4004 Td
(6412           s = "\(null\)";) 122.3184 Tj
0 -151.8938 Td
(6413         for\(; *s; s++\)) 117.9499 Tj
0 -161.3871 Td
(6414           cons_putc\(*s\);) 126.6869 Tj
0 -170.8805 Td
(6415         break;) 83.0018 Tj
0 -180.3739 Td
(6416       case '%':) 87.3703 Tj
0 -189.8672 Td
(6417         cons_putc\('%'\);) 122.3184 Tj
0 -199.3606 Td
(6418         break;) 83.0018 Tj
0 -208.8539 Td
(6419       default:) 83.0018 Tj
0 -218.3473 Td
(6420         // Print unknown % sequence to draw attention.) 257.7424 Tj
0 -227.8407 Td
(6421         cons_putc\('%'\);) 122.3184 Tj
0 -237.334 Td
(6422         cons_putc\(c\);) 113.5814 Tj
0 -246.8274 Td
(6423         break;) 83.0018 Tj
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(6424       }) 52.4222 Tj
0 -265.8141 Td
(6425       state = 0;) 91.7388 Tj
0 -275.3075 Td
(6426       break;) 74.2647 Tj
0 -284.8008 Td
(6427     }) 43.6851 Tj
0 -294.2942 Td
(6428   }) 34.9481 Tj
0 -303.7875 Td
(6429 ) 21.8426 Tj
0 -313.2809 Td
(6430   if\(locking\)) 78.6333 Tj
0 -322.7743 Td
(6431     release\(&console_lock\);) 139.7925 Tj
0 -332.2676 Td
(6432 }) 26.2111 Tj
0 -341.761 Td
(6433 ) 21.8426 Tj
0 -351.2543 Td
(6434 int) 34.9481 Tj
0 -360.7477 Td
(6435 console_write\(struct inode *ip, char *buf, int n\)) 235.8998 Tj
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(6436 {) 26.2111 Tj
0 -379.7344 Td
(6437   int i;) 56.7907 Tj
0 -389.2278 Td
(6438 ) 21.8426 Tj
0 -398.7211 Td
(6439   iunlock\(ip\);) 83.0018 Tj
0 -408.2145 Td
(6440   acquire\(&console_lock\);) 131.0554 Tj
0 -417.7079 Td
(6441   for\(i = 0; i < n; i++\)) 126.6869 Tj
0 -427.2012 Td
(6442     cons_putc\(buf[i] & 0xff\);) 148.5295 Tj
0 -436.6946 Td
(6443   release\(&console_lock\);) 131.0554 Tj
0 -446.1879 Td
(6444   ilock\(ip\);) 74.2647 Tj
0 -455.6813 Td
(6445 ) 21.8426 Tj
0 -465.1747 Td
(6446   return n;) 69.8962 Tj
0 -474.668 Td
(6447 }) 26.2111 Tj
0 -484.1614 Td
(6448 ) 21.8426 Tj
0 -493.6547 Td
(6449 ) 21.8426 Tj
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[1 0 0 1 0 0] Tm
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(Sep  3 10:05 2008  xv6/console.c  Page 5) 174.7406 Tj
0 -28.4801 Td
(6450 #define INPUT_BUF 128) 113.5814 Tj
0 -37.9735 Td
(6451 struct {) 56.7907 Tj
0 -47.4668 Td
(6452   struct spinlock lock;) 122.3184 Tj
0 -56.9602 Td
(6453   char buf[INPUT_BUF];) 117.9499 Tj
0 -66.4535 Td
(6454   uint r;  // Read index) 126.6869 Tj
0 -75.9469 Td
(6455   uint w;  // Write index) 131.0554 Tj
0 -85.4403 Td
(6456   uint e;  // Edit index) 126.6869 Tj
0 -94.9336 Td
(6457 } input;) 56.7907 Tj
0 -104.427 Td
(6458 ) 21.8426 Tj
0 -113.9203 Td
(6459 #define C\(x\)  \(\(x\)-'@'\)  // Control-x) 183.4776 Tj
0 -123.4137 Td
(6460 ) 21.8426 Tj
0 -132.9071 Td
(6461 void) 39.3166 Tj
0 -142.4004 Td
(6462 console_intr\(int \(*getc\)\(void\)\)) 157.2665 Tj
0 -151.8938 Td
(6463 {) 26.2111 Tj
0 -161.3871 Td
(6464   int c;) 56.7907 Tj
0 -170.8805 Td
(6465 ) 21.8426 Tj
0 -180.3739 Td
(6466   acquire\(&input.lock\);) 122.3184 Tj
0 -189.8672 Td
(6467   while\(\(c = getc\(\)\) >= 0\){) 139.7925 Tj
0 -199.3606 Td
(6468     switch\(c\){) 83.0018 Tj
0 -208.8539 Td
(6469     case C\('P'\):  // Process listing.) 183.4776 Tj
0 -218.3473 Td
(6470       procdump\(\);) 96.1073 Tj
0 -227.8407 Td
(6471       break;) 74.2647 Tj
0 -237.334 Td
(6472     case C\('U'\):  // Kill line.) 157.2665 Tj
0 -246.8274 Td
(6473       while\(input.e != input.w &&) 166.0035 Tj
0 -256.3207 Td
(6474             input.buf[\(input.e-1\) % INPUT_BUF] != '\\n'\)\
{) 266.4794 Tj
0 -265.8141 Td
(6475         input.e--;) 100.4758 Tj
0 -275.3075 Td
(6476         cons_putc\(BACKSPACE\);) 148.5295 Tj
0 -284.8008 Td
(6477       }) 52.4222 Tj
0 -294.2942 Td
(6478       break;) 74.2647 Tj
0 -303.7875 Td
(6479     case C\('H'\):  // Backspace) 152.898 Tj
0 -313.2809 Td
(6480       if\(input.e != input.w\){) 148.5295 Tj
0 -322.7743 Td
(6481         input.e--;) 100.4758 Tj
0 -332.2676 Td
(6482         cons_putc\(BACKSPACE\);) 148.5295 Tj
0 -341.761 Td
(6483       }) 52.4222 Tj
0 -351.2543 Td
(6484       break;) 74.2647 Tj
0 -360.7477 Td
(6485     default:) 74.2647 Tj
0 -370.2411 Td
(6486       if\(c != 0 && input.e-input.r < INPUT_BUF\){) 231.5313 Tj
0 -379.7344 Td
(6487         input.buf[input.e++ % INPUT_BUF] = c;) 218.4257 Tj
0 -389.2278 Td
(6488         cons_putc\(c\);) 113.5814 Tj
0 -398.7211 Td
(6489         if\(c == '\\n' || c == C\('D'\) || input.e == inpu\
t.r+INPUT_BUF\){) 323.2701 Tj
0 -408.2145 Td
(6490           input.w = input.e;) 144.161 Tj
0 -417.7079 Td
(6491           wakeup\(&input.r\);) 139.7925 Tj
0 -427.2012 Td
(6492         }) 61.1592 Tj
0 -436.6946 Td
(6493       }) 52.4222 Tj
0 -446.1879 Td
(6494       break;) 74.2647 Tj
0 -455.6813 Td
(6495     }) 43.6851 Tj
0 -465.1747 Td
(6496   }) 34.9481 Tj
0 -474.668 Td
(6497   release\(&input.lock\);) 122.3184 Tj
0 -484.1614 Td
(6498 }) 26.2111 Tj
0 -493.6547 Td
(6499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 64) 34.9481 Tj
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showpage
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0 0 612 792 re W
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q
180 3960 5760 3460 re
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/DeviceGray {} CS
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
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(Sep  3 10:05 2008  xv6/console.c  Page 6) 174.7406 Tj
0 -28.4801 Td
(6500 int) 34.9481 Tj
0 -37.9735 Td
(6501 console_read\(struct inode *ip, char *dst, int n\)) 231.5313 Tj
0 -47.4668 Td
(6502 {) 26.2111 Tj
0 -56.9602 Td
(6503   uint target;) 83.0018 Tj
0 -66.4535 Td
(6504   int c;) 56.7907 Tj
0 -75.9469 Td
(6505 ) 21.8426 Tj
0 -85.4403 Td
(6506   iunlock\(ip\);) 83.0018 Tj
0 -94.9336 Td
(6507   target = n;) 78.6333 Tj
0 -104.427 Td
(6508   acquire\(&input.lock\);) 122.3184 Tj
0 -113.9203 Td
(6509   while\(n > 0\){) 87.3703 Tj
0 -123.4137 Td
(6510     while\(input.r == input.w\){) 152.898 Tj
0 -132.9071 Td
(6511       if\(cp->killed\){) 113.5814 Tj
0 -142.4004 Td
(6512         release\(&input.lock\);) 148.5295 Tj
0 -151.8938 Td
(6513         ilock\(ip\);) 100.4758 Tj
0 -161.3871 Td
(6514         return -1;) 100.4758 Tj
0 -170.8805 Td
(6515       }) 52.4222 Tj
0 -180.3739 Td
(6516       sleep\(&input.r, &input.lock\);) 174.7406 Tj
0 -189.8672 Td
(6517     }) 43.6851 Tj
0 -199.3606 Td
(6518     c = input.buf[input.r++ % INPUT_BUF];) 200.9517 Tj
0 -208.8539 Td
(6519     if\(c == C\('D'\)\){  // EOF) 144.161 Tj
0 -218.3473 Td
(6520       if\(n < target\){) 113.5814 Tj
0 -227.8407 Td
(6521         // Save ^D for next time, to make sure) 222.7942 Tj
0 -237.334 Td
(6522         // caller gets a 0-byte result.) 192.2146 Tj
0 -246.8274 Td
(6523         input.r--;) 100.4758 Tj
0 -256.3207 Td
(6524       }) 52.4222 Tj
0 -265.8141 Td
(6525       break;) 74.2647 Tj
0 -275.3075 Td
(6526     }) 43.6851 Tj
0 -284.8008 Td
(6527     *dst++ = c;) 87.3703 Tj
0 -294.2942 Td
(6528     --n;) 56.7907 Tj
0 -303.7875 Td
(6529     if\(c == '\\n'\)) 96.1073 Tj
0 -313.2809 Td
(6530       break;) 74.2647 Tj
0 -322.7743 Td
(6531   }) 34.9481 Tj
0 -332.2676 Td
(6532   release\(&input.lock\);) 122.3184 Tj
0 -341.761 Td
(6533   ilock\(ip\);) 74.2647 Tj
0 -351.2543 Td
(6534 ) 21.8426 Tj
0 -360.7477 Td
(6535   return target - n;) 109.2129 Tj
0 -370.2411 Td
(6536 }) 26.2111 Tj
0 -379.7344 Td
(6537 ) 21.8426 Tj
0 -389.2278 Td
(6538 ) 21.8426 Tj
0 -398.7211 Td
(6539 ) 21.8426 Tj
0 -408.2145 Td
(6540 ) 21.8426 Tj
0 -417.7079 Td
(6541 ) 21.8426 Tj
0 -427.2012 Td
(6542 ) 21.8426 Tj
0 -436.6946 Td
(6543 ) 21.8426 Tj
0 -446.1879 Td
(6544 ) 21.8426 Tj
0 -455.6813 Td
(6545 ) 21.8426 Tj
0 -465.1747 Td
(6546 ) 21.8426 Tj
0 -474.668 Td
(6547 ) 21.8426 Tj
0 -484.1614 Td
(6548 ) 21.8426 Tj
0 -493.6547 Td
(6549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 65) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/console.c  Page 7) 174.7406 Tj
0 -28.4801 Td
(6550 void) 39.3166 Tj
0 -37.9735 Td
(6551 console_init\(void\)) 100.4758 Tj
0 -47.4668 Td
(6552 {) 26.2111 Tj
0 -56.9602 Td
(6553   initlock\(&console_lock, "console"\);) 183.4776 Tj
0 -66.4535 Td
(6554   initlock\(&input.lock, "console input"\);) 200.9517 Tj
0 -75.9469 Td
(6555 ) 21.8426 Tj
0 -85.4403 Td
(6556   devsw[CONSOLE].write = console_write;) 192.2146 Tj
0 -94.9336 Td
(6557   devsw[CONSOLE].read = console_read;) 183.4776 Tj
0 -104.427 Td
(6558   use_console_lock = 1;) 122.3184 Tj
0 -113.9203 Td
(6559 ) 21.8426 Tj
0 -123.4137 Td
(6560   pic_enable\(IRQ_KBD\);) 117.9499 Tj
0 -132.9071 Td
(6561   ioapic_enable\(IRQ_KBD, 0\);) 144.161 Tj
0 -142.4004 Td
(6562 }) 26.2111 Tj
0 -151.8938 Td
(6563 ) 21.8426 Tj
0 -161.3871 Td
(6564 void) 39.3166 Tj
0 -170.8805 Td
(6565 panic\(char *s\)) 83.0018 Tj
0 -180.3739 Td
(6566 {) 26.2111 Tj
0 -189.8672 Td
(6567   int i;) 56.7907 Tj
0 -199.3606 Td
(6568   uint pcs[10];) 87.3703 Tj
0 -208.8539 Td
(6569 ) 21.8426 Tj
0 -218.3473 Td
(6570   __asm __volatile\("cli"\);) 135.4239 Tj
0 -227.8407 Td
(6571   use_console_lock = 0;) 122.3184 Tj
0 -237.334 Td
(6572   cprintf\("cpu%d: panic: ", cpu\(\)\);) 174.7406 Tj
0 -246.8274 Td
(6573   cprintf\(s\);) 78.6333 Tj
0 -256.3207 Td
(6574   cprintf\("\\n"\);) 91.7388 Tj
0 -265.8141 Td
(6575   getcallerpcs\(&s, pcs\);) 126.6869 Tj
0 -275.3075 Td
(6576   for\(i=0; i<10; i++\)) 113.5814 Tj
0 -284.8008 Td
(6577     cprintf\(" %p", pcs[i]\);) 139.7925 Tj
0 -294.2942 Td
(6578   panicked = 1; // freeze other CPU) 174.7406 Tj
0 -303.7875 Td
(6579   for\(;;\)) 61.1592 Tj
0 -313.2809 Td
(6580     ;) 43.6851 Tj
0 -322.7743 Td
(6581 }) 26.2111 Tj
0 -332.2676 Td
(6582 ) 21.8426 Tj
0 -341.761 Td
(6583 ) 21.8426 Tj
0 -351.2543 Td
(6584 ) 21.8426 Tj
0 -360.7477 Td
(6585 ) 21.8426 Tj
0 -370.2411 Td
(6586 ) 21.8426 Tj
0 -379.7344 Td
(6587 ) 21.8426 Tj
0 -389.2278 Td
(6588 ) 21.8426 Tj
0 -398.7211 Td
(6589 ) 21.8426 Tj
0 -408.2145 Td
(6590 ) 21.8426 Tj
0 -417.7079 Td
(6591 ) 21.8426 Tj
0 -427.2012 Td
(6592 ) 21.8426 Tj
0 -436.6946 Td
(6593 ) 21.8426 Tj
0 -446.1879 Td
(6594 ) 21.8426 Tj
0 -455.6813 Td
(6595 ) 21.8426 Tj
0 -465.1747 Td
(6596 ) 21.8426 Tj
0 -474.668 Td
(6597 ) 21.8426 Tj
0 -484.1614 Td
(6598 ) 21.8426 Tj
0 -493.6547 Td
(6599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 65) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 73 73
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/timer.c  Page 1) 166.0035 Tj
0 -28.4801 Td
(6600 // Intel 8253/8254/82C54 Programmable Interval Timer \(PIT\
\).) 279.5849 Tj
0 -37.9735 Td
(6601 // Only used on uniprocessors;) 152.898 Tj
0 -47.4668 Td
(6602 // SMP machines use the local APIC timer.) 200.9517 Tj
0 -56.9602 Td
(6603 ) 21.8426 Tj
0 -66.4535 Td
(6604 #include "types.h") 100.4758 Tj
0 -75.9469 Td
(6605 #include "defs.h") 96.1073 Tj
0 -85.4403 Td
(6606 #include "traps.h") 100.4758 Tj
0 -94.9336 Td
(6607 #include "x86.h") 91.7388 Tj
0 -104.427 Td
(6608 ) 21.8426 Tj
0 -113.9203 Td
(6609 #define IO_TIMER1       0x040           // 8253 Timer #1) 266.4794 Tj
0 -123.4137 Td
(6610 ) 21.8426 Tj
0 -132.9071 Td
(6611 // Frequency of all three count-down timers;) 214.0572 Tj
0 -142.4004 Td
(6612 // \(TIMER_FREQ/freq\) is the appropriate count) 218.4257 Tj
0 -151.8938 Td
(6613 // to generate a frequency of freq Hz.) 187.8461 Tj
0 -161.3871 Td
(6614 ) 21.8426 Tj
0 -170.8805 Td
(6615 #define TIMER_FREQ      1193182) 157.2665 Tj
0 -180.3739 Td
(6616 #define TIMER_DIV\(x\)    \(\(TIMER_FREQ+\(x\)/2\)/\(x\)\)) 231.5313 Tj
0 -189.8672 Td
(6617 ) 21.8426 Tj
0 -199.3606 Td
(6618 #define TIMER_MODE      \(IO_TIMER1 + 3\) // timer mode po\
rt) 275.2164 Tj
0 -208.8539 Td
(6619 #define TIMER_SEL0      0x00    // select counter 0) 244.6368 Tj
0 -218.3473 Td
(6620 #define TIMER_RATEGEN   0x04    // mode 2, rate generator) 270.8479 Tj
0 -227.8407 Td
(6621 #define TIMER_16BIT     0x30    // r/w counter 16 bits, LS\
B first) 305.796 Tj
0 -237.334 Td
(6622 ) 21.8426 Tj
0 -246.8274 Td
(6623 void) 39.3166 Tj
0 -256.3207 Td
(6624 timer_init\(void\)) 91.7388 Tj
0 -265.8141 Td
(6625 {) 26.2111 Tj
0 -275.3075 Td
(6626   // Interrupt 100 times/sec.) 148.5295 Tj
0 -284.8008 Td
(6627   outb\(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16B\
IT\);) 288.322 Tj
0 -294.2942 Td
(6628   outb\(IO_TIMER1, TIMER_DIV\(100\) % 256\);) 196.5831 Tj
0 -303.7875 Td
(6629   outb\(IO_TIMER1, TIMER_DIV\(100\) / 256\);) 196.5831 Tj
0 -313.2809 Td
(6630   pic_enable\(IRQ_TIMER\);) 126.6869 Tj
0 -322.7743 Td
(6631 }) 26.2111 Tj
0 -332.2676 Td
(6632 ) 21.8426 Tj
0 -341.761 Td
(6633 ) 21.8426 Tj
0 -351.2543 Td
(6634 ) 21.8426 Tj
0 -360.7477 Td
(6635 ) 21.8426 Tj
0 -370.2411 Td
(6636 ) 21.8426 Tj
0 -379.7344 Td
(6637 ) 21.8426 Tj
0 -389.2278 Td
(6638 ) 21.8426 Tj
0 -398.7211 Td
(6639 ) 21.8426 Tj
0 -408.2145 Td
(6640 ) 21.8426 Tj
0 -417.7079 Td
(6641 ) 21.8426 Tj
0 -427.2012 Td
(6642 ) 21.8426 Tj
0 -436.6946 Td
(6643 ) 21.8426 Tj
0 -446.1879 Td
(6644 ) 21.8426 Tj
0 -455.6813 Td
(6645 ) 21.8426 Tj
0 -465.1747 Td
(6646 ) 21.8426 Tj
0 -474.668 Td
(6647 ) 21.8426 Tj
0 -484.1614 Td
(6648 ) 21.8426 Tj
0 -493.6547 Td
(6649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 66) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/timer.c  Page 2) 166.0035 Tj
0 -28.4801 Td
(6650 // Blank page) 78.6333 Tj
0 -37.9735 Td
(6651 ) 21.8426 Tj
0 -47.4668 Td
(6652 ) 21.8426 Tj
0 -56.9602 Td
(6653 ) 21.8426 Tj
0 -66.4535 Td
(6654 ) 21.8426 Tj
0 -75.9469 Td
(6655 ) 21.8426 Tj
0 -85.4403 Td
(6656 ) 21.8426 Tj
0 -94.9336 Td
(6657 ) 21.8426 Tj
0 -104.427 Td
(6658 ) 21.8426 Tj
0 -113.9203 Td
(6659 ) 21.8426 Tj
0 -123.4137 Td
(6660 ) 21.8426 Tj
0 -132.9071 Td
(6661 ) 21.8426 Tj
0 -142.4004 Td
(6662 ) 21.8426 Tj
0 -151.8938 Td
(6663 ) 21.8426 Tj
0 -161.3871 Td
(6664 ) 21.8426 Tj
0 -170.8805 Td
(6665 ) 21.8426 Tj
0 -180.3739 Td
(6666 ) 21.8426 Tj
0 -189.8672 Td
(6667 ) 21.8426 Tj
0 -199.3606 Td
(6668 ) 21.8426 Tj
0 -208.8539 Td
(6669 ) 21.8426 Tj
0 -218.3473 Td
(6670 ) 21.8426 Tj
0 -227.8407 Td
(6671 ) 21.8426 Tj
0 -237.334 Td
(6672 ) 21.8426 Tj
0 -246.8274 Td
(6673 ) 21.8426 Tj
0 -256.3207 Td
(6674 ) 21.8426 Tj
0 -265.8141 Td
(6675 ) 21.8426 Tj
0 -275.3075 Td
(6676 ) 21.8426 Tj
0 -284.8008 Td
(6677 ) 21.8426 Tj
0 -294.2942 Td
(6678 ) 21.8426 Tj
0 -303.7875 Td
(6679 ) 21.8426 Tj
0 -313.2809 Td
(6680 ) 21.8426 Tj
0 -322.7743 Td
(6681 ) 21.8426 Tj
0 -332.2676 Td
(6682 ) 21.8426 Tj
0 -341.761 Td
(6683 ) 21.8426 Tj
0 -351.2543 Td
(6684 ) 21.8426 Tj
0 -360.7477 Td
(6685 ) 21.8426 Tj
0 -370.2411 Td
(6686 ) 21.8426 Tj
0 -379.7344 Td
(6687 ) 21.8426 Tj
0 -389.2278 Td
(6688 ) 21.8426 Tj
0 -398.7211 Td
(6689 ) 21.8426 Tj
0 -408.2145 Td
(6690 ) 21.8426 Tj
0 -417.7079 Td
(6691 ) 21.8426 Tj
0 -427.2012 Td
(6692 ) 21.8426 Tj
0 -436.6946 Td
(6693 ) 21.8426 Tj
0 -446.1879 Td
(6694 ) 21.8426 Tj
0 -455.6813 Td
(6695 ) 21.8426 Tj
0 -465.1747 Td
(6696 ) 21.8426 Tj
0 -474.668 Td
(6697 ) 21.8426 Tj
0 -484.1614 Td
(6698 ) 21.8426 Tj
0 -493.6547 Td
(6699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 66) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 74 74
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/initcode.S  Page 1) 179.1091 Tj
0 -28.4801 Td
(6700 # Initial process execs /init.) 152.898 Tj
0 -37.9735 Td
(6701 ) 21.8426 Tj
0 -47.4668 Td
(6702 #include "syscall.h") 109.2129 Tj
0 -56.9602 Td
(6703 #include "traps.h") 100.4758 Tj
0 -66.4535 Td
(6704 ) 21.8426 Tj
0 -75.9469 Td
(6705 # exec\(init, argv\)) 100.4758 Tj
0 -85.4403 Td
(6706 .globl start) 74.2647 Tj
0 -94.9336 Td
(6707 start:) 48.0537 Tj
0 -104.427 Td
(6708   pushl $argv) 78.6333 Tj
0 -113.9203 Td
(6709   pushl $init) 78.6333 Tj
0 -123.4137 Td
(6710   pushl $0) 65.5277 Tj
0 -132.9071 Td
(6711   movl $SYS_exec, %eax) 117.9499 Tj
0 -142.4004 Td
(6712   int $T_SYSCALL) 91.7388 Tj
0 -151.8938 Td
(6713 ) 21.8426 Tj
0 -161.3871 Td
(6714 # for\(;;\) exit\(\);) 96.1073 Tj
0 -170.8805 Td
(6715 exit:) 43.6851 Tj
0 -180.3739 Td
(6716   movl $SYS_exit, %eax) 117.9499 Tj
0 -189.8672 Td
(6717   int $T_SYSCALL) 91.7388 Tj
0 -199.3606 Td
(6718   jmp exit) 65.5277 Tj
0 -208.8539 Td
(6719 ) 21.8426 Tj
0 -218.3473 Td
(6720 # char init[] = "/init\\0";) 135.4239 Tj
0 -227.8407 Td
(6721 init:) 43.6851 Tj
0 -237.334 Td
(6722   .string "/init\\0") 104.8443 Tj
0 -246.8274 Td
(6723 ) 21.8426 Tj
0 -256.3207 Td
(6724 # char *argv[] = { init, 0 };) 148.5295 Tj
0 -265.8141 Td
(6725 .p2align 2) 65.5277 Tj
0 -275.3075 Td
(6726 argv:) 43.6851 Tj
0 -284.8008 Td
(6727   .long init) 74.2647 Tj
0 -294.2942 Td
(6728   .long 0) 61.1592 Tj
0 -303.7875 Td
(6729 ) 21.8426 Tj
0 -313.2809 Td
(6730 ) 21.8426 Tj
0 -322.7743 Td
(6731 ) 21.8426 Tj
0 -332.2676 Td
(6732 ) 21.8426 Tj
0 -341.761 Td
(6733 ) 21.8426 Tj
0 -351.2543 Td
(6734 ) 21.8426 Tj
0 -360.7477 Td
(6735 ) 21.8426 Tj
0 -370.2411 Td
(6736 ) 21.8426 Tj
0 -379.7344 Td
(6737 ) 21.8426 Tj
0 -389.2278 Td
(6738 ) 21.8426 Tj
0 -398.7211 Td
(6739 ) 21.8426 Tj
0 -408.2145 Td
(6740 ) 21.8426 Tj
0 -417.7079 Td
(6741 ) 21.8426 Tj
0 -427.2012 Td
(6742 ) 21.8426 Tj
0 -436.6946 Td
(6743 ) 21.8426 Tj
0 -446.1879 Td
(6744 ) 21.8426 Tj
0 -455.6813 Td
(6745 ) 21.8426 Tj
0 -465.1747 Td
(6746 ) 21.8426 Tj
0 -474.668 Td
(6747 ) 21.8426 Tj
0 -484.1614 Td
(6748 ) 21.8426 Tj
0 -493.6547 Td
(6749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 67) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/init.c  Page 1) 161.635 Tj
0 -28.4801 Td
(6750 // init: The initial user-level program) 192.2146 Tj
0 -37.9735 Td
(6751 ) 21.8426 Tj
0 -47.4668 Td
(6752 #include "types.h") 100.4758 Tj
0 -56.9602 Td
(6753 #include "stat.h") 96.1073 Tj
0 -66.4535 Td
(6754 #include "user.h") 96.1073 Tj
0 -75.9469 Td
(6755 #include "fcntl.h") 100.4758 Tj
0 -85.4403 Td
(6756 ) 21.8426 Tj
0 -94.9336 Td
(6757 char *sh_args[] = { "sh", 0 };) 152.898 Tj
0 -104.427 Td
(6758 ) 21.8426 Tj
0 -113.9203 Td
(6759 int) 34.9481 Tj
0 -123.4137 Td
(6760 main\(void\)) 65.5277 Tj
0 -132.9071 Td
(6761 {) 26.2111 Tj
0 -142.4004 Td
(6762   int pid, wpid;) 91.7388 Tj
0 -151.8938 Td
(6763 ) 21.8426 Tj
0 -161.3871 Td
(6764   if\(open\("console", O_RDWR\) < 0\){) 170.3721 Tj
0 -170.8805 Td
(6765     mknod\("console", 1, 1\);) 139.7925 Tj
0 -180.3739 Td
(6766     open\("console", O_RDWR\);) 144.161 Tj
0 -189.8672 Td
(6767   }) 34.9481 Tj
0 -199.3606 Td
(6768   dup\(0\);  // stdout) 109.2129 Tj
0 -208.8539 Td
(6769   dup\(0\);  // stderr) 109.2129 Tj
0 -218.3473 Td
(6770 ) 21.8426 Tj
0 -227.8407 Td
(6771   for\(;;\){) 65.5277 Tj
0 -237.334 Td
(6772     printf\(1, "init: starting sh\\n"\);) 183.4776 Tj
0 -246.8274 Td
(6773     pid = fork\(\);) 96.1073 Tj
0 -256.3207 Td
(6774     if\(pid < 0\){) 91.7388 Tj
0 -265.8141 Td
(6775       printf\(1, "init: fork failed\\n"\);) 192.2146 Tj
0 -275.3075 Td
(6776       exit\(\);) 78.6333 Tj
0 -284.8008 Td
(6777     }) 43.6851 Tj
0 -294.2942 Td
(6778     if\(pid == 0\){) 96.1073 Tj
0 -303.7875 Td
(6779       exec\("sh", sh_args\);) 135.4239 Tj
0 -313.2809 Td
(6780       printf\(1, "init: exec sh failed\\n"\);) 205.3202 Tj
0 -322.7743 Td
(6781       exit\(\);) 78.6333 Tj
0 -332.2676 Td
(6782     }) 43.6851 Tj
0 -341.761 Td
(6783     while\(\(wpid=wait\(\)\) >= 0 && wpid != pid\)) 214.0572 Tj
0 -351.2543 Td
(6784       printf\(1, "zombie!\\n"\);) 148.5295 Tj
0 -360.7477 Td
(6785   }) 34.9481 Tj
0 -370.2411 Td
(6786 }) 26.2111 Tj
0 -379.7344 Td
(6787 ) 21.8426 Tj
0 -389.2278 Td
(6788 ) 21.8426 Tj
0 -398.7211 Td
(6789 ) 21.8426 Tj
0 -408.2145 Td
(6790 ) 21.8426 Tj
0 -417.7079 Td
(6791 ) 21.8426 Tj
0 -427.2012 Td
(6792 ) 21.8426 Tj
0 -436.6946 Td
(6793 ) 21.8426 Tj
0 -446.1879 Td
(6794 ) 21.8426 Tj
0 -455.6813 Td
(6795 ) 21.8426 Tj
0 -465.1747 Td
(6796 ) 21.8426 Tj
0 -474.668 Td
(6797 ) 21.8426 Tj
0 -484.1614 Td
(6798 ) 21.8426 Tj
0 -493.6547 Td
(6799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 67) 34.9481 Tj
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(Sep  3 10:05 2008  xv6/usys.S  Page 1) 161.635 Tj
0 -28.4801 Td
(6800 #include "syscall.h") 109.2129 Tj
0 -37.9735 Td
(6801 #include "traps.h") 100.4758 Tj
0 -47.4668 Td
(6802 ) 21.8426 Tj
0 -56.9602 Td
(6803 #define STUB\(name\) \\) 109.2129 Tj
0 -66.4535 Td
(6804   .globl name; \\) 91.7388 Tj
0 -75.9469 Td
(6805   name: \\) 61.1592 Tj
0 -85.4403 Td
(6806     movl $SYS_ ## name, %eax; \\) 157.2665 Tj
0 -94.9336 Td
(6807     int $T_SYSCALL; \\) 113.5814 Tj
0 -104.427 Td
(6808     ret) 52.4222 Tj
0 -113.9203 Td
(6809 ) 21.8426 Tj
0 -123.4137 Td
(6810 STUB\(fork\)) 65.5277 Tj
0 -132.9071 Td
(6811 STUB\(exit\)) 65.5277 Tj
0 -142.4004 Td
(6812 STUB\(wait\)) 65.5277 Tj
0 -151.8938 Td
(6813 STUB\(pipe\)) 65.5277 Tj
0 -161.3871 Td
(6814 STUB\(read\)) 65.5277 Tj
0 -170.8805 Td
(6815 STUB\(write\)) 69.8962 Tj
0 -180.3739 Td
(6816 STUB\(close\)) 69.8962 Tj
0 -189.8672 Td
(6817 STUB\(kill\)) 65.5277 Tj
0 -199.3606 Td
(6818 STUB\(exec\)) 65.5277 Tj
0 -208.8539 Td
(6819 STUB\(open\)) 65.5277 Tj
0 -218.3473 Td
(6820 STUB\(mknod\)) 69.8962 Tj
0 -227.8407 Td
(6821 STUB\(unlink\)) 74.2647 Tj
0 -237.334 Td
(6822 STUB\(fstat\)) 69.8962 Tj
0 -246.8274 Td
(6823 STUB\(link\)) 65.5277 Tj
0 -256.3207 Td
(6824 STUB\(mkdir\)) 69.8962 Tj
0 -265.8141 Td
(6825 STUB\(chdir\)) 69.8962 Tj
0 -275.3075 Td
(6826 STUB\(dup\)) 61.1592 Tj
0 -284.8008 Td
(6827 STUB\(getpid\)) 74.2647 Tj
0 -294.2942 Td
(6828 STUB\(sbrk\)) 65.5277 Tj
0 -303.7875 Td
(6829 STUB\(sleep\)) 69.8962 Tj
0 -313.2809 Td
(6830 ) 21.8426 Tj
0 -322.7743 Td
(6831 ) 21.8426 Tj
0 -332.2676 Td
(6832 ) 21.8426 Tj
0 -341.761 Td
(6833 ) 21.8426 Tj
0 -351.2543 Td
(6834 ) 21.8426 Tj
0 -360.7477 Td
(6835 ) 21.8426 Tj
0 -370.2411 Td
(6836 ) 21.8426 Tj
0 -379.7344 Td
(6837 ) 21.8426 Tj
0 -389.2278 Td
(6838 ) 21.8426 Tj
0 -398.7211 Td
(6839 ) 21.8426 Tj
0 -408.2145 Td
(6840 ) 21.8426 Tj
0 -417.7079 Td
(6841 ) 21.8426 Tj
0 -427.2012 Td
(6842 ) 21.8426 Tj
0 -436.6946 Td
(6843 ) 21.8426 Tj
0 -446.1879 Td
(6844 ) 21.8426 Tj
0 -455.6813 Td
(6845 ) 21.8426 Tj
0 -465.1747 Td
(6846 ) 21.8426 Tj
0 -474.668 Td
(6847 ) 21.8426 Tj
0 -484.1614 Td
(6848 ) 21.8426 Tj
0 -493.6547 Td
(6849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 68) 34.9481 Tj
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q
180 500 5760 3460 re
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/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sh.c  Page 1) 152.898 Tj
0 -28.4801 Td
(6850 // Shell.) 61.1592 Tj
0 -37.9735 Td
(6851 ) 21.8426 Tj
0 -47.4668 Td
(6852 #include "types.h") 100.4758 Tj
0 -56.9602 Td
(6853 #include "user.h") 96.1073 Tj
0 -66.4535 Td
(6854 #include "fcntl.h") 100.4758 Tj
0 -75.9469 Td
(6855 ) 21.8426 Tj
0 -85.4403 Td
(6856 // Parsed command representation) 161.635 Tj
0 -94.9336 Td
(6857 #define EXEC  1) 87.3703 Tj
0 -104.427 Td
(6858 #define REDIR 2) 87.3703 Tj
0 -113.9203 Td
(6859 #define PIPE  3) 87.3703 Tj
0 -123.4137 Td
(6860 #define LIST  4) 87.3703 Tj
0 -132.9071 Td
(6861 #define BACK  5) 87.3703 Tj
0 -142.4004 Td
(6862 ) 21.8426 Tj
0 -151.8938 Td
(6863 #define MAXARGS 10) 100.4758 Tj
0 -161.3871 Td
(6864 ) 21.8426 Tj
0 -170.8805 Td
(6865 struct cmd {) 74.2647 Tj
0 -180.3739 Td
(6866   int type;) 69.8962 Tj
0 -189.8672 Td
(6867 };) 30.5796 Tj
0 -199.3606 Td
(6868 ) 21.8426 Tj
0 -208.8539 Td
(6869 struct execcmd {) 91.7388 Tj
0 -218.3473 Td
(6870   int type;) 69.8962 Tj
0 -227.8407 Td
(6871   char *argv[MAXARGS];) 117.9499 Tj
0 -237.334 Td
(6872   char *eargv[MAXARGS];) 122.3184 Tj
0 -246.8274 Td
(6873 };) 30.5796 Tj
0 -256.3207 Td
(6874 ) 21.8426 Tj
0 -265.8141 Td
(6875 struct redircmd {) 96.1073 Tj
0 -275.3075 Td
(6876   int type;) 69.8962 Tj
0 -284.8008 Td
(6877   struct cmd *cmd;) 100.4758 Tj
0 -294.2942 Td
(6878   char *file;) 78.6333 Tj
0 -303.7875 Td
(6879   char *efile;) 83.0018 Tj
0 -313.2809 Td
(6880   int mode;) 69.8962 Tj
0 -322.7743 Td
(6881   int fd;) 61.1592 Tj
0 -332.2676 Td
(6882 };) 30.5796 Tj
0 -341.761 Td
(6883 ) 21.8426 Tj
0 -351.2543 Td
(6884 struct pipecmd {) 91.7388 Tj
0 -360.7477 Td
(6885   int type;) 69.8962 Tj
0 -370.2411 Td
(6886   struct cmd *left;) 104.8443 Tj
0 -379.7344 Td
(6887   struct cmd *right;) 109.2129 Tj
0 -389.2278 Td
(6888 };) 30.5796 Tj
0 -398.7211 Td
(6889 ) 21.8426 Tj
0 -408.2145 Td
(6890 struct listcmd {) 91.7388 Tj
0 -417.7079 Td
(6891   int type;) 69.8962 Tj
0 -427.2012 Td
(6892   struct cmd *left;) 104.8443 Tj
0 -436.6946 Td
(6893   struct cmd *right;) 109.2129 Tj
0 -446.1879 Td
(6894 };) 30.5796 Tj
0 -455.6813 Td
(6895 ) 21.8426 Tj
0 -465.1747 Td
(6896 struct backcmd {) 91.7388 Tj
0 -474.668 Td
(6897   int type;) 69.8962 Tj
0 -484.1614 Td
(6898   struct cmd *cmd;) 100.4758 Tj
0 -493.6547 Td
(6899 };) 30.5796 Tj
0 -522.1348 Td
(Sheet 68) 34.9481 Tj
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showpage
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[] 0 d
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180 3960 5760 3460 re
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
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0 0 Td
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(Sep  3 10:05 2008  xv6/sh.c  Page 2) 152.898 Tj
0 -28.4801 Td
(6900 int fork1\(void\);  // Fork but panics on failure.) 231.5313 Tj
0 -37.9735 Td
(6901 void panic\(char*\);) 100.4758 Tj
0 -47.4668 Td
(6902 struct cmd *parsecmd\(char*\);) 144.161 Tj
0 -56.9602 Td
(6903 ) 21.8426 Tj
0 -66.4535 Td
(6904 // Execute cmd.  Never returns.) 157.2665 Tj
0 -75.9469 Td
(6905 void) 39.3166 Tj
0 -85.4403 Td
(6906 runcmd\(struct cmd *cmd\)) 122.3184 Tj
0 -94.9336 Td
(6907 {) 26.2111 Tj
0 -104.427 Td
(6908   int p[2];) 69.8962 Tj
0 -113.9203 Td
(6909   struct backcmd *bcmd;) 122.3184 Tj
0 -123.4137 Td
(6910   struct execcmd *ecmd;) 122.3184 Tj
0 -132.9071 Td
(6911   struct listcmd *lcmd;) 122.3184 Tj
0 -142.4004 Td
(6912   struct pipecmd *pcmd;) 122.3184 Tj
0 -151.8938 Td
(6913   struct redircmd *rcmd;) 126.6869 Tj
0 -161.3871 Td
(6914 ) 21.8426 Tj
0 -170.8805 Td
(6915   if\(cmd == 0\)) 83.0018 Tj
0 -180.3739 Td
(6916     exit\(\);) 69.8962 Tj
0 -189.8672 Td
(6917 ) 21.8426 Tj
0 -199.3606 Td
(6918   switch\(cmd->type\){) 109.2129 Tj
0 -208.8539 Td
(6919   default:) 65.5277 Tj
0 -218.3473 Td
(6920     panic\("runcmd"\);) 109.2129 Tj
0 -227.8407 Td
(6921 ) 21.8426 Tj
0 -237.334 Td
(6922   case EXEC:) 74.2647 Tj
0 -246.8274 Td
(6923     ecmd = \(struct execcmd*\)cmd;) 161.635 Tj
0 -256.3207 Td
(6924     if\(ecmd->argv[0] == 0\)) 135.4239 Tj
0 -265.8141 Td
(6925       exit\(\);) 78.6333 Tj
0 -275.3075 Td
(6926     exec\(ecmd->argv[0], ecmd->argv\);) 179.1091 Tj
0 -284.8008 Td
(6927     printf\(2, "exec %s failed\\n", ecmd->argv[0]\);) 235.8998 Tj
0 -294.2942 Td
(6928     break;) 65.5277 Tj
0 -303.7875 Td
(6929 ) 21.8426 Tj
0 -313.2809 Td
(6930   case REDIR:) 78.6333 Tj
0 -322.7743 Td
(6931     rcmd = \(struct redircmd*\)cmd;) 166.0035 Tj
0 -332.2676 Td
(6932     close\(rcmd->fd\);) 109.2129 Tj
0 -341.761 Td
(6933     if\(open\(rcmd->file, rcmd->mode\) < 0\){) 200.9517 Tj
0 -351.2543 Td
(6934       printf\(2, "open %s failed\\n", rcmd->file\);) 231.5313 Tj
0 -360.7477 Td
(6935       exit\(\);) 78.6333 Tj
0 -370.2411 Td
(6936     }) 43.6851 Tj
0 -379.7344 Td
(6937     runcmd\(rcmd->cmd\);) 117.9499 Tj
0 -389.2278 Td
(6938     break;) 65.5277 Tj
0 -398.7211 Td
(6939 ) 21.8426 Tj
0 -408.2145 Td
(6940   case LIST:) 74.2647 Tj
0 -417.7079 Td
(6941     lcmd = \(struct listcmd*\)cmd;) 161.635 Tj
0 -427.2012 Td
(6942     if\(fork1\(\) == 0\)) 109.2129 Tj
0 -436.6946 Td
(6943       runcmd\(lcmd->left\);) 131.0554 Tj
0 -446.1879 Td
(6944     wait\(\);) 69.8962 Tj
0 -455.6813 Td
(6945     runcmd\(lcmd->right\);) 126.6869 Tj
0 -465.1747 Td
(6946     break;) 65.5277 Tj
0 -474.668 Td
(6947 ) 21.8426 Tj
0 -484.1614 Td
(6948 ) 21.8426 Tj
0 -493.6547 Td
(6949 ) 21.8426 Tj
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(Sheet 69) 34.9481 Tj
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0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sh.c  Page 3) 152.898 Tj
0 -28.4801 Td
(6950   case PIPE:) 74.2647 Tj
0 -37.9735 Td
(6951     pcmd = \(struct pipecmd*\)cmd;) 161.635 Tj
0 -47.4668 Td
(6952     if\(pipe\(p\) < 0\)) 104.8443 Tj
0 -56.9602 Td
(6953       panic\("pipe"\);) 109.2129 Tj
0 -66.4535 Td
(6954     if\(fork1\(\) == 0\){) 113.5814 Tj
0 -75.9469 Td
(6955       close\(1\);) 87.3703 Tj
0 -85.4403 Td
(6956       dup\(p[1]\);) 91.7388 Tj
0 -94.9336 Td
(6957       close\(p[0]\);) 100.4758 Tj
0 -104.427 Td
(6958       close\(p[1]\);) 100.4758 Tj
0 -113.9203 Td
(6959       runcmd\(pcmd->left\);) 131.0554 Tj
0 -123.4137 Td
(6960     }) 43.6851 Tj
0 -132.9071 Td
(6961     if\(fork1\(\) == 0\){) 113.5814 Tj
0 -142.4004 Td
(6962       close\(0\);) 87.3703 Tj
0 -151.8938 Td
(6963       dup\(p[0]\);) 91.7388 Tj
0 -161.3871 Td
(6964       close\(p[0]\);) 100.4758 Tj
0 -170.8805 Td
(6965       close\(p[1]\);) 100.4758 Tj
0 -180.3739 Td
(6966       runcmd\(pcmd->right\);) 135.4239 Tj
0 -189.8672 Td
(6967     }) 43.6851 Tj
0 -199.3606 Td
(6968     close\(p[0]\);) 91.7388 Tj
0 -208.8539 Td
(6969     close\(p[1]\);) 91.7388 Tj
0 -218.3473 Td
(6970     wait\(\);) 69.8962 Tj
0 -227.8407 Td
(6971     wait\(\);) 69.8962 Tj
0 -237.334 Td
(6972     break;) 65.5277 Tj
0 -246.8274 Td
(6973 ) 21.8426 Tj
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(6974   case BACK:) 74.2647 Tj
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(6975     bcmd = \(struct backcmd*\)cmd;) 161.635 Tj
0 -275.3075 Td
(6976     if\(fork1\(\) == 0\)) 109.2129 Tj
0 -284.8008 Td
(6977       runcmd\(bcmd->cmd\);) 126.6869 Tj
0 -294.2942 Td
(6978     break;) 65.5277 Tj
0 -303.7875 Td
(6979   }) 34.9481 Tj
0 -313.2809 Td
(6980   exit\(\);) 61.1592 Tj
0 -322.7743 Td
(6981 }) 26.2111 Tj
0 -332.2676 Td
(6982 ) 21.8426 Tj
0 -341.761 Td
(6983 int) 34.9481 Tj
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(6984 getcmd\(char *buf, int nbuf\)) 139.7925 Tj
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(6986   printf\(2, "$ "\);) 100.4758 Tj
0 -379.7344 Td
(6987   memset\(buf, 0, nbuf\);) 122.3184 Tj
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(6988   gets\(buf, nbuf\);) 100.4758 Tj
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(6989   if\(buf[0] == 0\) // EOF) 126.6869 Tj
0 -408.2145 Td
(6990     return -1;) 83.0018 Tj
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(6991   return 0;) 69.8962 Tj
0 -427.2012 Td
(6992 }) 26.2111 Tj
0 -436.6946 Td
(6993 ) 21.8426 Tj
0 -446.1879 Td
(6994 ) 21.8426 Tj
0 -455.6813 Td
(6995 ) 21.8426 Tj
0 -465.1747 Td
(6996 ) 21.8426 Tj
0 -474.668 Td
(6997 ) 21.8426 Tj
0 -484.1614 Td
(6998 ) 21.8426 Tj
0 -493.6547 Td
(6999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 69) 34.9481 Tj
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showpage
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(Sep  3 10:05 2008  xv6/sh.c  Page 4) 152.898 Tj
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(7000 int) 34.9481 Tj
0 -37.9735 Td
(7001 main\(void\)) 65.5277 Tj
0 -47.4668 Td
(7002 {) 26.2111 Tj
0 -56.9602 Td
(7003   static char buf[100];) 122.3184 Tj
0 -66.4535 Td
(7004   int fd;) 61.1592 Tj
0 -75.9469 Td
(7005 ) 21.8426 Tj
0 -85.4403 Td
(7006   // Assumes three file descriptors open.) 200.9517 Tj
0 -94.9336 Td
(7007   while\(\(fd = open\("console", O_RDWR\)\) >= 0\){) 218.4257 Tj
0 -104.427 Td
(7008     if\(fd >= 3\){) 91.7388 Tj
0 -113.9203 Td
(7009       close\(fd\);) 91.7388 Tj
0 -123.4137 Td
(7010       break;) 74.2647 Tj
0 -132.9071 Td
(7011     }) 43.6851 Tj
0 -142.4004 Td
(7012   }) 34.9481 Tj
0 -151.8938 Td
(7013 ) 21.8426 Tj
0 -161.3871 Td
(7014   // Read and run input commands.) 166.0035 Tj
0 -170.8805 Td
(7015   while\(getcmd\(buf, sizeof\(buf\)\) >= 0\){) 192.2146 Tj
0 -180.3739 Td
(7016     if\(buf[0] == 'c' && buf[1] == 'd' && buf[2] == ' '\){) 266.4794 Tj
0 -189.8672 Td
(7017       // Clumsy but will have to do for now.) 214.0572 Tj
0 -199.3606 Td
(7018       // Chdir has no effect on the parent if run in the c\
hild.) 297.059 Tj
0 -208.8539 Td
(7019       buf[strlen\(buf\)-1] = 0;  // chop \\n) 200.9517 Tj
0 -218.3473 Td
(7020       if\(chdir\(buf+3\) < 0\)) 135.4239 Tj
0 -227.8407 Td
(7021         printf\(2, "cannot cd %s\\n", buf+3\);) 209.6887 Tj
0 -237.334 Td
(7022       continue;) 87.3703 Tj
0 -246.8274 Td
(7023     }) 43.6851 Tj
0 -256.3207 Td
(7024     if\(fork1\(\) == 0\)) 109.2129 Tj
0 -265.8141 Td
(7025       runcmd\(parsecmd\(buf\)\);) 144.161 Tj
0 -275.3075 Td
(7026     wait\(\);) 69.8962 Tj
0 -284.8008 Td
(7027   }) 34.9481 Tj
0 -294.2942 Td
(7028   exit\(\);) 61.1592 Tj
0 -303.7875 Td
(7029 }) 26.2111 Tj
0 -313.2809 Td
(7030 ) 21.8426 Tj
0 -322.7743 Td
(7031 void) 39.3166 Tj
0 -332.2676 Td
(7032 panic\(char *s\)) 83.0018 Tj
0 -341.761 Td
(7033 {) 26.2111 Tj
0 -351.2543 Td
(7034   printf\(2, "%s\\n", s\);) 122.3184 Tj
0 -360.7477 Td
(7035   exit\(\);) 61.1592 Tj
0 -370.2411 Td
(7036 }) 26.2111 Tj
0 -379.7344 Td
(7037 ) 21.8426 Tj
0 -389.2278 Td
(7038 int) 34.9481 Tj
0 -398.7211 Td
(7039 fork1\(void\)) 69.8962 Tj
0 -408.2145 Td
(7040 {) 26.2111 Tj
0 -417.7079 Td
(7041   int pid;) 65.5277 Tj
0 -427.2012 Td
(7042 ) 21.8426 Tj
0 -436.6946 Td
(7043   pid = fork\(\);) 87.3703 Tj
0 -446.1879 Td
(7044   if\(pid == -1\)) 87.3703 Tj
0 -455.6813 Td
(7045     panic\("fork"\);) 100.4758 Tj
0 -465.1747 Td
(7046   return pid;) 78.6333 Tj
0 -474.668 Td
(7047 }) 26.2111 Tj
0 -484.1614 Td
(7048 ) 21.8426 Tj
0 -493.6547 Td
(7049 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 70) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sh.c  Page 5) 152.898 Tj
0 -28.4801 Td
(7050 // Constructors) 87.3703 Tj
0 -37.9735 Td
(7051 ) 21.8426 Tj
0 -47.4668 Td
(7052 struct cmd*) 69.8962 Tj
0 -56.9602 Td
(7053 execcmd\(void\)) 78.6333 Tj
0 -66.4535 Td
(7054 {) 26.2111 Tj
0 -75.9469 Td
(7055   struct execcmd *cmd;) 117.9499 Tj
0 -85.4403 Td
(7056 ) 21.8426 Tj
0 -94.9336 Td
(7057   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -104.427 Td
(7058   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -113.9203 Td
(7059   cmd->type = EXEC;) 104.8443 Tj
0 -123.4137 Td
(7060   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -132.9071 Td
(7061 }) 26.2111 Tj
0 -142.4004 Td
(7062 ) 21.8426 Tj
0 -151.8938 Td
(7063 struct cmd*) 69.8962 Tj
0 -161.3871 Td
(7064 redircmd\(struct cmd *subcmd, char *file, char *efile, int\
 mode, int fd\)) 332.0071 Tj
0 -170.8805 Td
(7065 {) 26.2111 Tj
0 -180.3739 Td
(7066   struct redircmd *cmd;) 122.3184 Tj
0 -189.8672 Td
(7067 ) 21.8426 Tj
0 -199.3606 Td
(7068   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -208.8539 Td
(7069   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -218.3473 Td
(7070   cmd->type = REDIR;) 109.2129 Tj
0 -227.8407 Td
(7071   cmd->cmd = subcmd;) 109.2129 Tj
0 -237.334 Td
(7072   cmd->file = file;) 104.8443 Tj
0 -246.8274 Td
(7073   cmd->efile = efile;) 113.5814 Tj
0 -256.3207 Td
(7074   cmd->mode = mode;) 104.8443 Tj
0 -265.8141 Td
(7075   cmd->fd = fd;) 87.3703 Tj
0 -275.3075 Td
(7076   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -284.8008 Td
(7077 }) 26.2111 Tj
0 -294.2942 Td
(7078 ) 21.8426 Tj
0 -303.7875 Td
(7079 struct cmd*) 69.8962 Tj
0 -313.2809 Td
(7080 pipecmd\(struct cmd *left, struct cmd *right\)) 214.0572 Tj
0 -322.7743 Td
(7081 {) 26.2111 Tj
0 -332.2676 Td
(7082   struct pipecmd *cmd;) 117.9499 Tj
0 -341.761 Td
(7083 ) 21.8426 Tj
0 -351.2543 Td
(7084   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -360.7477 Td
(7085   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -370.2411 Td
(7086   cmd->type = PIPE;) 104.8443 Tj
0 -379.7344 Td
(7087   cmd->left = left;) 104.8443 Tj
0 -389.2278 Td
(7088   cmd->right = right;) 113.5814 Tj
0 -398.7211 Td
(7089   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -408.2145 Td
(7090 }) 26.2111 Tj
0 -417.7079 Td
(7091 ) 21.8426 Tj
0 -427.2012 Td
(7092 ) 21.8426 Tj
0 -436.6946 Td
(7093 ) 21.8426 Tj
0 -446.1879 Td
(7094 ) 21.8426 Tj
0 -455.6813 Td
(7095 ) 21.8426 Tj
0 -465.1747 Td
(7096 ) 21.8426 Tj
0 -474.668 Td
(7097 ) 21.8426 Tj
0 -484.1614 Td
(7098 ) 21.8426 Tj
0 -493.6547 Td
(7099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 70) 34.9481 Tj
Q
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showpage
%%PageTrailer
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(Sep  3 10:05 2008  xv6/sh.c  Page 6) 152.898 Tj
0 -28.4801 Td
(7100 struct cmd*) 69.8962 Tj
0 -37.9735 Td
(7101 listcmd\(struct cmd *left, struct cmd *right\)) 214.0572 Tj
0 -47.4668 Td
(7102 {) 26.2111 Tj
0 -56.9602 Td
(7103   struct listcmd *cmd;) 117.9499 Tj
0 -66.4535 Td
(7104 ) 21.8426 Tj
0 -75.9469 Td
(7105   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -85.4403 Td
(7106   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -94.9336 Td
(7107   cmd->type = LIST;) 104.8443 Tj
0 -104.427 Td
(7108   cmd->left = left;) 104.8443 Tj
0 -113.9203 Td
(7109   cmd->right = right;) 113.5814 Tj
0 -123.4137 Td
(7110   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -132.9071 Td
(7111 }) 26.2111 Tj
0 -142.4004 Td
(7112 ) 21.8426 Tj
0 -151.8938 Td
(7113 struct cmd*) 69.8962 Tj
0 -161.3871 Td
(7114 backcmd\(struct cmd *subcmd\)) 139.7925 Tj
0 -170.8805 Td
(7115 {) 26.2111 Tj
0 -180.3739 Td
(7116   struct backcmd *cmd;) 117.9499 Tj
0 -189.8672 Td
(7117 ) 21.8426 Tj
0 -199.3606 Td
(7118   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -208.8539 Td
(7119   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -218.3473 Td
(7120   cmd->type = BACK;) 104.8443 Tj
0 -227.8407 Td
(7121   cmd->cmd = subcmd;) 109.2129 Tj
0 -237.334 Td
(7122   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -246.8274 Td
(7123 }) 26.2111 Tj
0 -256.3207 Td
(7124 ) 21.8426 Tj
0 -265.8141 Td
(7125 ) 21.8426 Tj
0 -275.3075 Td
(7126 ) 21.8426 Tj
0 -284.8008 Td
(7127 ) 21.8426 Tj
0 -294.2942 Td
(7128 ) 21.8426 Tj
0 -303.7875 Td
(7129 ) 21.8426 Tj
0 -313.2809 Td
(7130 ) 21.8426 Tj
0 -322.7743 Td
(7131 ) 21.8426 Tj
0 -332.2676 Td
(7132 ) 21.8426 Tj
0 -341.761 Td
(7133 ) 21.8426 Tj
0 -351.2543 Td
(7134 ) 21.8426 Tj
0 -360.7477 Td
(7135 ) 21.8426 Tj
0 -370.2411 Td
(7136 ) 21.8426 Tj
0 -379.7344 Td
(7137 ) 21.8426 Tj
0 -389.2278 Td
(7138 ) 21.8426 Tj
0 -398.7211 Td
(7139 ) 21.8426 Tj
0 -408.2145 Td
(7140 ) 21.8426 Tj
0 -417.7079 Td
(7141 ) 21.8426 Tj
0 -427.2012 Td
(7142 ) 21.8426 Tj
0 -436.6946 Td
(7143 ) 21.8426 Tj
0 -446.1879 Td
(7144 ) 21.8426 Tj
0 -455.6813 Td
(7145 ) 21.8426 Tj
0 -465.1747 Td
(7146 ) 21.8426 Tj
0 -474.668 Td
(7147 ) 21.8426 Tj
0 -484.1614 Td
(7148 ) 21.8426 Tj
0 -493.6547 Td
(7149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 71) 34.9481 Tj
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Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sh.c  Page 7) 152.898 Tj
0 -28.4801 Td
(7150 // Parsing) 65.5277 Tj
0 -37.9735 Td
(7151 ) 21.8426 Tj
0 -47.4668 Td
(7152 char whitespace[] = " \\t\\r\\n\\v";) 161.635 Tj
0 -56.9602 Td
(7153 char symbols[] = "<|>&;\(\)";) 139.7925 Tj
0 -66.4535 Td
(7154 ) 21.8426 Tj
0 -75.9469 Td
(7155 int) 34.9481 Tj
0 -85.4403 Td
(7156 gettoken\(char **ps, char *es, char **q, char **eq\)) 240.2683 Tj
0 -94.9336 Td
(7157 {) 26.2111 Tj
0 -104.427 Td
(7158   char *s;) 65.5277 Tj
0 -113.9203 Td
(7159   int ret;) 65.5277 Tj
0 -123.4137 Td
(7160 ) 21.8426 Tj
0 -132.9071 Td
(7161   s = *ps;) 65.5277 Tj
0 -142.4004 Td
(7162   while\(s < es && strchr\(whitespace, *s\)\)) 200.9517 Tj
0 -151.8938 Td
(7163     s++;) 56.7907 Tj
0 -161.3871 Td
(7164   if\(q\)) 52.4222 Tj
0 -170.8805 Td
(7165     *q = s;) 69.8962 Tj
0 -180.3739 Td
(7166   ret = *s;) 69.8962 Tj
0 -189.8672 Td
(7167   switch\(*s\){) 78.6333 Tj
0 -199.3606 Td
(7168   case 0:) 61.1592 Tj
0 -208.8539 Td
(7169     break;) 65.5277 Tj
0 -218.3473 Td
(7170   case '|':) 69.8962 Tj
0 -227.8407 Td
(7171   case '\(':) 69.8962 Tj
0 -237.334 Td
(7172   case '\)':) 69.8962 Tj
0 -246.8274 Td
(7173   case ';':) 69.8962 Tj
0 -256.3207 Td
(7174   case '&':) 69.8962 Tj
0 -265.8141 Td
(7175   case '<':) 69.8962 Tj
0 -275.3075 Td
(7176     s++;) 56.7907 Tj
0 -284.8008 Td
(7177     break;) 65.5277 Tj
0 -294.2942 Td
(7178   case '>':) 69.8962 Tj
0 -303.7875 Td
(7179     s++;) 56.7907 Tj
0 -313.2809 Td
(7180     if\(*s == '>'\){) 100.4758 Tj
0 -322.7743 Td
(7181       ret = '+';) 91.7388 Tj
0 -332.2676 Td
(7182       s++;) 65.5277 Tj
0 -341.761 Td
(7183     }) 43.6851 Tj
0 -351.2543 Td
(7184     break;) 65.5277 Tj
0 -360.7477 Td
(7185   default:) 65.5277 Tj
0 -370.2411 Td
(7186     ret = 'a';) 83.0018 Tj
0 -379.7344 Td
(7187     while\(s < es && !strchr\(whitespace, *s\) && !strchr\(\
symbols, *s\)\)) 318.9016 Tj
0 -389.2278 Td
(7188       s++;) 65.5277 Tj
0 -398.7211 Td
(7189     break;) 65.5277 Tj
0 -408.2145 Td
(7190   }) 34.9481 Tj
0 -417.7079 Td
(7191   if\(eq\)) 56.7907 Tj
0 -427.2012 Td
(7192     *eq = s;) 74.2647 Tj
0 -436.6946 Td
(7193 ) 21.8426 Tj
0 -446.1879 Td
(7194   while\(s < es && strchr\(whitespace, *s\)\)) 200.9517 Tj
0 -455.6813 Td
(7195     s++;) 56.7907 Tj
0 -465.1747 Td
(7196   *ps = s;) 65.5277 Tj
0 -474.668 Td
(7197   return ret;) 78.6333 Tj
0 -484.1614 Td
(7198 }) 26.2111 Tj
0 -493.6547 Td
(7199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 71) 34.9481 Tj
Q
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showpage
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-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
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q
180 3960 5760 3460 re
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/DeviceGray {} CS
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
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0 0 Td
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(Sep  3 10:05 2008  xv6/sh.c  Page 8) 152.898 Tj
0 -28.4801 Td
(7200 int) 34.9481 Tj
0 -37.9735 Td
(7201 peek\(char **ps, char *es, char *toks\)) 183.4776 Tj
0 -47.4668 Td
(7202 {) 26.2111 Tj
0 -56.9602 Td
(7203   char *s;) 65.5277 Tj
0 -66.4535 Td
(7204 ) 21.8426 Tj
0 -75.9469 Td
(7205   s = *ps;) 65.5277 Tj
0 -85.4403 Td
(7206   while\(s < es && strchr\(whitespace, *s\)\)) 200.9517 Tj
0 -94.9336 Td
(7207     s++;) 56.7907 Tj
0 -104.427 Td
(7208   *ps = s;) 65.5277 Tj
0 -113.9203 Td
(7209   return *s && strchr\(toks, *s\);) 161.635 Tj
0 -123.4137 Td
(7210 }) 26.2111 Tj
0 -132.9071 Td
(7211 ) 21.8426 Tj
0 -142.4004 Td
(7212 struct cmd *parseline\(char**, char*\);) 183.4776 Tj
0 -151.8938 Td
(7213 struct cmd *parsepipe\(char**, char*\);) 183.4776 Tj
0 -161.3871 Td
(7214 struct cmd *parseexec\(char**, char*\);) 183.4776 Tj
0 -170.8805 Td
(7215 struct cmd *nulterminate\(struct cmd*\);) 187.8461 Tj
0 -180.3739 Td
(7216 ) 21.8426 Tj
0 -189.8672 Td
(7217 struct cmd*) 69.8962 Tj
0 -199.3606 Td
(7218 parsecmd\(char *s\)) 96.1073 Tj
0 -208.8539 Td
(7219 {) 26.2111 Tj
0 -218.3473 Td
(7220   char *es;) 69.8962 Tj
0 -227.8407 Td
(7221   struct cmd *cmd;) 100.4758 Tj
0 -237.334 Td
(7222 ) 21.8426 Tj
0 -246.8274 Td
(7223   es = s + strlen\(s\);) 113.5814 Tj
0 -256.3207 Td
(7224   cmd = parseline\(&s, es\);) 135.4239 Tj
0 -265.8141 Td
(7225   peek\(&s, es, ""\);) 104.8443 Tj
0 -275.3075 Td
(7226   if\(s != es\){) 83.0018 Tj
0 -284.8008 Td
(7227     printf\(2, "leftovers: %s\\n", s\);) 179.1091 Tj
0 -294.2942 Td
(7228     panic\("syntax"\);) 109.2129 Tj
0 -303.7875 Td
(7229   }) 34.9481 Tj
0 -313.2809 Td
(7230   nulterminate\(cmd\);) 109.2129 Tj
0 -322.7743 Td
(7231   return cmd;) 78.6333 Tj
0 -332.2676 Td
(7232 }) 26.2111 Tj
0 -341.761 Td
(7233 ) 21.8426 Tj
0 -351.2543 Td
(7234 struct cmd*) 69.8962 Tj
0 -360.7477 Td
(7235 parseline\(char **ps, char *es\)) 152.898 Tj
0 -370.2411 Td
(7236 {) 26.2111 Tj
0 -379.7344 Td
(7237   struct cmd *cmd;) 100.4758 Tj
0 -389.2278 Td
(7238 ) 21.8426 Tj
0 -398.7211 Td
(7239   cmd = parsepipe\(ps, es\);) 135.4239 Tj
0 -408.2145 Td
(7240   while\(peek\(ps, es, "&"\)\){) 139.7925 Tj
0 -417.7079 Td
(7241     gettoken\(ps, es, 0, 0\);) 139.7925 Tj
0 -427.2012 Td
(7242     cmd = backcmd\(cmd\);) 122.3184 Tj
0 -436.6946 Td
(7243   }) 34.9481 Tj
0 -446.1879 Td
(7244   if\(peek\(ps, es, ";"\)\){) 126.6869 Tj
0 -455.6813 Td
(7245     gettoken\(ps, es, 0, 0\);) 139.7925 Tj
0 -465.1747 Td
(7246     cmd = listcmd\(cmd, parseline\(ps, es\)\);) 205.3202 Tj
0 -474.668 Td
(7247   }) 34.9481 Tj
0 -484.1614 Td
(7248   return cmd;) 78.6333 Tj
0 -493.6547 Td
(7249 }) 26.2111 Tj
0 -522.1348 Td
(Sheet 72) 34.9481 Tj
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q
180 500 5760 3460 re
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/DeviceGray {} cs
[0] sc
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[1 0 0 1 0 0] Tm
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(Sep  3 10:05 2008  xv6/sh.c  Page 9) 152.898 Tj
0 -28.4801 Td
(7250 struct cmd*) 69.8962 Tj
0 -37.9735 Td
(7251 parsepipe\(char **ps, char *es\)) 152.898 Tj
0 -47.4668 Td
(7252 {) 26.2111 Tj
0 -56.9602 Td
(7253   struct cmd *cmd;) 100.4758 Tj
0 -66.4535 Td
(7254 ) 21.8426 Tj
0 -75.9469 Td
(7255   cmd = parseexec\(ps, es\);) 135.4239 Tj
0 -85.4403 Td
(7256   if\(peek\(ps, es, "|"\)\){) 126.6869 Tj
0 -94.9336 Td
(7257     gettoken\(ps, es, 0, 0\);) 139.7925 Tj
0 -104.427 Td
(7258     cmd = pipecmd\(cmd, parsepipe\(ps, es\)\);) 205.3202 Tj
0 -113.9203 Td
(7259   }) 34.9481 Tj
0 -123.4137 Td
(7260   return cmd;) 78.6333 Tj
0 -132.9071 Td
(7261 }) 26.2111 Tj
0 -142.4004 Td
(7262 ) 21.8426 Tj
0 -151.8938 Td
(7263 struct cmd*) 69.8962 Tj
0 -161.3871 Td
(7264 parseredirs\(struct cmd *cmd, char **ps, char *es\)) 235.8998 Tj
0 -170.8805 Td
(7265 {) 26.2111 Tj
0 -180.3739 Td
(7266   int tok;) 65.5277 Tj
0 -189.8672 Td
(7267   char *q, *eq;) 87.3703 Tj
0 -199.3606 Td
(7268 ) 21.8426 Tj
0 -208.8539 Td
(7269   while\(peek\(ps, es, "<>"\)\){) 144.161 Tj
0 -218.3473 Td
(7270     tok = gettoken\(ps, es, 0, 0\);) 166.0035 Tj
0 -227.8407 Td
(7271     if\(gettoken\(ps, es, &q, &eq\) != 'a'\)) 196.5831 Tj
0 -237.334 Td
(7272       panic\("missing file for redirection"\);) 214.0572 Tj
0 -246.8274 Td
(7273     switch\(tok\){) 91.7388 Tj
0 -256.3207 Td
(7274     case '<':) 78.6333 Tj
0 -265.8141 Td
(7275       cmd = redircmd\(cmd, q, eq, O_RDONLY, 0\);) 222.7942 Tj
0 -275.3075 Td
(7276       break;) 74.2647 Tj
0 -284.8008 Td
(7277     case '>':) 78.6333 Tj
0 -294.2942 Td
(7278       cmd = redircmd\(cmd, q, eq, O_WRONLY|O_CREATE, 1\);) 262.1109 Tj
0 -303.7875 Td
(7279       break;) 74.2647 Tj
0 -313.2809 Td
(7280     case '+':  // >>) 109.2129 Tj
0 -322.7743 Td
(7281       cmd = redircmd\(cmd, q, eq, O_WRONLY|O_CREATE, 1\);) 262.1109 Tj
0 -332.2676 Td
(7282       break;) 74.2647 Tj
0 -341.761 Td
(7283     }) 43.6851 Tj
0 -351.2543 Td
(7284   }) 34.9481 Tj
0 -360.7477 Td
(7285   return cmd;) 78.6333 Tj
0 -370.2411 Td
(7286 }) 26.2111 Tj
0 -379.7344 Td
(7287 ) 21.8426 Tj
0 -389.2278 Td
(7288 ) 21.8426 Tj
0 -398.7211 Td
(7289 ) 21.8426 Tj
0 -408.2145 Td
(7290 ) 21.8426 Tj
0 -417.7079 Td
(7291 ) 21.8426 Tj
0 -427.2012 Td
(7292 ) 21.8426 Tj
0 -436.6946 Td
(7293 ) 21.8426 Tj
0 -446.1879 Td
(7294 ) 21.8426 Tj
0 -455.6813 Td
(7295 ) 21.8426 Tj
0 -465.1747 Td
(7296 ) 21.8426 Tj
0 -474.668 Td
(7297 ) 21.8426 Tj
0 -484.1614 Td
(7298 ) 21.8426 Tj
0 -493.6547 Td
(7299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 72) 34.9481 Tj
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showpage
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[0.1 0 0 0.1 0 0] cm
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180 3960 5760 3460 re
W
/DeviceGray {} CS
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sh.c  Page 10) 157.2665 Tj
0 -28.4801 Td
(7300 struct cmd*) 69.8962 Tj
0 -37.9735 Td
(7301 parseblock\(char **ps, char *es\)) 157.2665 Tj
0 -47.4668 Td
(7302 {) 26.2111 Tj
0 -56.9602 Td
(7303   struct cmd *cmd;) 100.4758 Tj
0 -66.4535 Td
(7304 ) 21.8426 Tj
0 -75.9469 Td
(7305   if\(!peek\(ps, es, "\("\)\)) 126.6869 Tj
0 -85.4403 Td
(7306     panic\("parseblock"\);) 126.6869 Tj
0 -94.9336 Td
(7307   gettoken\(ps, es, 0, 0\);) 131.0554 Tj
0 -104.427 Td
(7308   cmd = parseline\(ps, es\);) 135.4239 Tj
0 -113.9203 Td
(7309   if\(!peek\(ps, es, "\)"\)\)) 126.6869 Tj
0 -123.4137 Td
(7310     panic\("syntax - missing \)"\);) 161.635 Tj
0 -132.9071 Td
(7311   gettoken\(ps, es, 0, 0\);) 131.0554 Tj
0 -142.4004 Td
(7312   cmd = parseredirs\(cmd, ps, es\);) 166.0035 Tj
0 -151.8938 Td
(7313   return cmd;) 78.6333 Tj
0 -161.3871 Td
(7314 }) 26.2111 Tj
0 -170.8805 Td
(7315 ) 21.8426 Tj
0 -180.3739 Td
(7316 struct cmd*) 69.8962 Tj
0 -189.8672 Td
(7317 parseexec\(char **ps, char *es\)) 152.898 Tj
0 -199.3606 Td
(7318 {) 26.2111 Tj
0 -208.8539 Td
(7319   char *q, *eq;) 87.3703 Tj
0 -218.3473 Td
(7320   int tok, argc;) 91.7388 Tj
0 -227.8407 Td
(7321   struct execcmd *cmd;) 117.9499 Tj
0 -237.334 Td
(7322   struct cmd *ret;) 100.4758 Tj
0 -246.8274 Td
(7323 ) 21.8426 Tj
0 -256.3207 Td
(7324   if\(peek\(ps, es, "\("\)\)) 122.3184 Tj
0 -265.8141 Td
(7325     return parseblock\(ps, es\);) 152.898 Tj
0 -275.3075 Td
(7326 ) 21.8426 Tj
0 -284.8008 Td
(7327   ret = execcmd\(\);) 100.4758 Tj
0 -294.2942 Td
(7328   cmd = \(struct execcmd*\)ret;) 148.5295 Tj
0 -303.7875 Td
(7329 ) 21.8426 Tj
0 -313.2809 Td
(7330   argc = 0;) 69.8962 Tj
0 -322.7743 Td
(7331   ret = parseredirs\(ret, ps, es\);) 166.0035 Tj
0 -332.2676 Td
(7332   while\(!peek\(ps, es, "|\)&;"\)\){) 157.2665 Tj
0 -341.761 Td
(7333     if\(\(tok=gettoken\(ps, es, &q, &eq\)\) == 0\)) 214.0572 Tj
0 -351.2543 Td
(7334       break;) 74.2647 Tj
0 -360.7477 Td
(7335     if\(tok != 'a'\)) 100.4758 Tj
0 -370.2411 Td
(7336       panic\("syntax"\);) 117.9499 Tj
0 -379.7344 Td
(7337     cmd->argv[argc] = q;) 126.6869 Tj
0 -389.2278 Td
(7338     cmd->eargv[argc] = eq;) 135.4239 Tj
0 -398.7211 Td
(7339     argc++;) 69.8962 Tj
0 -408.2145 Td
(7340     if\(argc >= MAXARGS\)) 122.3184 Tj
0 -417.7079 Td
(7341       panic\("too many args"\);) 148.5295 Tj
0 -427.2012 Td
(7342     ret = parseredirs\(ret, ps, es\);) 174.7406 Tj
0 -436.6946 Td
(7343   }) 34.9481 Tj
0 -446.1879 Td
(7344   cmd->argv[argc] = 0;) 117.9499 Tj
0 -455.6813 Td
(7345   cmd->eargv[argc] = 0;) 122.3184 Tj
0 -465.1747 Td
(7346   return ret;) 78.6333 Tj
0 -474.668 Td
(7347 }) 26.2111 Tj
0 -484.1614 Td
(7348 ) 21.8426 Tj
0 -493.6547 Td
(7349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 73) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Sep  3 10:05 2008  xv6/sh.c  Page 11) 157.2665 Tj
0 -28.4801 Td
(7350 // NUL-terminate all the counted strings.) 200.9517 Tj
0 -37.9735 Td
(7351 struct cmd*) 69.8962 Tj
0 -47.4668 Td
(7352 nulterminate\(struct cmd *cmd\)) 148.5295 Tj
0 -56.9602 Td
(7353 {) 26.2111 Tj
0 -66.4535 Td
(7354   int i;) 56.7907 Tj
0 -75.9469 Td
(7355   struct backcmd *bcmd;) 122.3184 Tj
0 -85.4403 Td
(7356   struct execcmd *ecmd;) 122.3184 Tj
0 -94.9336 Td
(7357   struct listcmd *lcmd;) 122.3184 Tj
0 -104.427 Td
(7358   struct pipecmd *pcmd;) 122.3184 Tj
0 -113.9203 Td
(7359   struct redircmd *rcmd;) 126.6869 Tj
0 -123.4137 Td
(7360 ) 21.8426 Tj
0 -132.9071 Td
(7361   if\(cmd == 0\)) 83.0018 Tj
0 -142.4004 Td
(7362     return 0;) 78.6333 Tj
0 -151.8938 Td
(7363 ) 21.8426 Tj
0 -161.3871 Td
(7364   switch\(cmd->type\){) 109.2129 Tj
0 -170.8805 Td
(7365   case EXEC:) 74.2647 Tj
0 -180.3739 Td
(7366     ecmd = \(struct execcmd*\)cmd;) 161.635 Tj
0 -189.8672 Td
(7367     for\(i=0; ecmd->argv[i]; i++\)) 161.635 Tj
0 -199.3606 Td
(7368       *ecmd->eargv[i] = 0;) 135.4239 Tj
0 -208.8539 Td
(7369     break;) 65.5277 Tj
0 -218.3473 Td
(7370 ) 21.8426 Tj
0 -227.8407 Td
(7371   case REDIR:) 78.6333 Tj
0 -237.334 Td
(7372     rcmd = \(struct redircmd*\)cmd;) 166.0035 Tj
0 -246.8274 Td
(7373     nulterminate\(rcmd->cmd\);) 144.161 Tj
0 -256.3207 Td
(7374     *rcmd->efile = 0;) 113.5814 Tj
0 -265.8141 Td
(7375     break;) 65.5277 Tj
0 -275.3075 Td
(7376 ) 21.8426 Tj
0 -284.8008 Td
(7377   case PIPE:) 74.2647 Tj
0 -294.2942 Td
(7378     pcmd = \(struct pipecmd*\)cmd;) 161.635 Tj
0 -303.7875 Td
(7379     nulterminate\(pcmd->left\);) 148.5295 Tj
0 -313.2809 Td
(7380     nulterminate\(pcmd->right\);) 152.898 Tj
0 -322.7743 Td
(7381     break;) 65.5277 Tj
0 -332.2676 Td
(7382 ) 21.8426 Tj
0 -341.761 Td
(7383   case LIST:) 74.2647 Tj
0 -351.2543 Td
(7384     lcmd = \(struct listcmd*\)cmd;) 161.635 Tj
0 -360.7477 Td
(7385     nulterminate\(lcmd->left\);) 148.5295 Tj
0 -370.2411 Td
(7386     nulterminate\(lcmd->right\);) 152.898 Tj
0 -379.7344 Td
(7387     break;) 65.5277 Tj
0 -389.2278 Td
(7388 ) 21.8426 Tj
0 -398.7211 Td
(7389   case BACK:) 74.2647 Tj
0 -408.2145 Td
(7390     bcmd = \(struct backcmd*\)cmd;) 161.635 Tj
0 -417.7079 Td
(7391     nulterminate\(bcmd->cmd\);) 144.161 Tj
0 -427.2012 Td
(7392     break;) 65.5277 Tj
0 -436.6946 Td
(7393   }) 34.9481 Tj
0 -446.1879 Td
(7394   return cmd;) 78.6333 Tj
0 -455.6813 Td
(7395 }) 26.2111 Tj
0 -465.1747 Td
(7396 ) 21.8426 Tj
0 -474.668 Td
(7397 ) 21.8426 Tj
0 -484.1614 Td
(7398 ) 21.8426 Tj
0 -493.6547 Td
(7399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 73) 34.9481 Tj
Q
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